diff --git a/src/EditorFeatures/CSharpTest/Completion/CompletionProviders/ExtensionMethodImportCompletionProviderTests.cs b/src/EditorFeatures/CSharpTest/Completion/CompletionProviders/ExtensionMethodImportCompletionProviderTests.cs
index ee2a95af102b0..685c847fc75d9 100644
--- a/src/EditorFeatures/CSharpTest/Completion/CompletionProviders/ExtensionMethodImportCompletionProviderTests.cs
+++ b/src/EditorFeatures/CSharpTest/Completion/CompletionProviders/ExtensionMethodImportCompletionProviderTests.cs
@@ -100,7 +100,7 @@ namespace Foo
             {
                 public static class ExtensionClass
                 {
-                    public static bool ExtentionMethod(this {{type1}} x)
+                    public static bool ExtensionMethod(this {{type1}} x)
                         => true;
                 }
             }
@@ -124,7 +124,7 @@ public void M({{type2}} x)
 
         await VerifyImportItemExistsAsync(
              markup,
-             "ExtentionMethod",
+             "ExtensionMethod",
              glyph: Glyph.ExtensionMethodPublic,
              inlineDescription: "Foo");
     }
@@ -140,7 +140,7 @@ namespace Foo
             {
                 public static class ExtensionClass
                 {
-                    public static bool ExtentionMethod(this MyInt x)
+                    public static bool ExtensionMethod(this MyInt x)
                         => true;
                 }
             }
@@ -163,7 +163,7 @@ public void M(int x)
 
         await VerifyImportItemExistsAsync(
              markup,
-             "ExtentionMethod",
+             "ExtensionMethod",
              glyph: Glyph.ExtensionMethodPublic,
              inlineDescription: "Foo");
     }
@@ -179,7 +179,7 @@ namespace Foo
             {
                 public static class ExtensionClass
                 {
-                    public static bool ExtentionMethod(this MyInt x)
+                    public static bool ExtensionMethod(this MyInt x)
                         => true;
                 }
             }
@@ -202,7 +202,7 @@ public void M(int x)
 
         await VerifyImportItemExistsAsync(
              markup,
-             "ExtentionMethod",
+             "ExtensionMethod",
              glyph: Glyph.ExtensionMethodPublic,
              inlineDescription: "Foo");
     }
@@ -218,7 +218,7 @@ namespace Foo
             {
                 public static class ExtensionClass
                 {
-                    public static bool ExtentionMethod(this MyAlias x)
+                    public static bool ExtensionMethod(this MyAlias x)
                         => true;
                 }
             }
@@ -241,7 +241,7 @@ public void M(Exception x)
 
         await VerifyImportItemExistsAsync(
              markup,
-             "ExtentionMethod",
+             "ExtensionMethod",
              glyph: Glyph.ExtensionMethodPublic,
              inlineDescription: "Foo");
     }
@@ -257,7 +257,7 @@ namespace Foo
             {
                 public static class ExtensionClass
                 {
-                    public static bool ExtentionMethod(this MyAlias x)
+                    public static bool ExtensionMethod(this MyAlias x)
                         => true;
                 }
             }
@@ -280,7 +280,7 @@ public void M(System.Collections.Generic.List<int> x)
 
         await VerifyImportItemExistsAsync(
              markup,
-             "ExtentionMethod",
+             "ExtensionMethod",
              glyph: Glyph.ExtensionMethodPublic,
              inlineDescription: "Foo");
     }
@@ -295,7 +295,7 @@ namespace Foo
             {
                 public static class ExtensionClass
                 {
-                    public static bool ExtentionMethod(this System.DateTime x)
+                    public static bool ExtensionMethod(this System.DateTime x)
                         => true;
                 }
             }
@@ -318,7 +318,7 @@ public void M(DateTime x)
 
         await VerifyImportItemExistsAsync(
              markup,
-             "ExtentionMethod",
+             "ExtensionMethod",
              glyph: Glyph.ExtensionMethodPublic,
              inlineDescription: "Foo");
     }
@@ -334,7 +334,7 @@ namespace Foo
             {
                 public static class ExtensionClass
                 {
-                    public static bool ExtentionMethod<T>(this GenericCollection.List<T> x)
+                    public static bool ExtensionMethod<T>(this GenericCollection.List<T> x)
                         => true;
                 }
             }
@@ -357,7 +357,7 @@ public void M(System.Collections.Generic.List<int> x)
 
         await VerifyImportItemExistsAsync(
              markup,
-             "ExtentionMethod",
+             "ExtensionMethod",
              displayTextSuffix: "<>",
              glyph: Glyph.ExtensionMethodPublic,
              inlineDescription: "Foo");
@@ -373,7 +373,7 @@ namespace Foo
             {
                 public static class ExtensionClass
                 {
-                    public static bool ExtentionMethod(this int x)
+                    public static bool ExtensionMethod(this int x)
                         => true;
                 }
             }
@@ -397,7 +397,7 @@ public void M(MyInt x)
 
         await VerifyImportItemExistsAsync(
              markup,
-             "ExtentionMethod",
+             "ExtensionMethod",
              glyph: Glyph.ExtensionMethodPublic,
              inlineDescription: "Foo");
     }
@@ -414,7 +414,7 @@ namespace Foo
             {
                 public static class ExtensionClass
                 {
-                    public static bool ExtentionMethod(this MyType t)
+                    public static bool ExtensionMethod(this MyType t)
                         => true;
                 }
             }
@@ -436,7 +436,7 @@ public void M(MyType x)
         var markup = GetMarkup(file2, file1, refType);
         await VerifyImportItemExistsAsync(
              markup,
-             "ExtentionMethod",
+             "ExtensionMethod",
              glyph: Glyph.ExtensionMethodPublic,
              inlineDescription: "Foo");
     }
@@ -453,7 +453,7 @@ namespace Foo
             {
                 public static class ExtensionClass
                 {
-                    public static bool ExtentionMethod(this object t)
+                    public static bool ExtensionMethod(this object t)
                         => true;
                 }
             }
@@ -475,7 +475,7 @@ public void M(MyType x)
         var markup = GetMarkup(file2, file1, refType);
         await VerifyImportItemExistsAsync(
              markup,
-             "ExtentionMethod",
+             "ExtensionMethod",
              glyph: Glyph.ExtensionMethodPublic,
              inlineDescription: "Foo");
     }
@@ -498,7 +498,7 @@ namespace Foo
             {
                 public static class ExtensionClass
                 {
-                    public static bool ExtentionMethod(this {{tupleType}} t)
+                    public static bool ExtensionMethod(this {{tupleType}} t)
                         => true;
                 }
             }
@@ -520,7 +520,7 @@ public void M({{tupleType}} x)
         var markup = GetMarkup(file2, file1, refType);
         await VerifyImportItemExistsAsync(
              markup,
-             "ExtentionMethod",
+             "ExtensionMethod",
              glyph: Glyph.ExtensionMethodPublic,
              inlineDescription: "Foo");
     }
@@ -542,7 +542,7 @@ namespace Foo
             {
                 public static class ExtensionClass
                 {
-                    public static bool ExtentionMethod(this MyBase t)
+                    public static bool ExtensionMethod(this MyBase t)
                         => true;
                 }
             }
@@ -564,7 +564,7 @@ public void M(MyType x)
         var markup = GetMarkup(file2, file1, refType);
         await VerifyImportItemExistsAsync(
              markup,
-             "ExtentionMethod",
+             "ExtensionMethod",
              glyph: Glyph.ExtensionMethodPublic,
              inlineDescription: "Foo");
     }
@@ -588,7 +588,7 @@ namespace Foo
             {
                 public static class ExtensionClass
                 {
-                    public static bool ExtentionMethod(this IEnumerable<string> t)
+                    public static bool ExtensionMethod(this IEnumerable<string> t)
                         => true;
                 }
             }
@@ -611,7 +611,7 @@ public void M({{type}} x)
         var markup = GetMarkup(file2, file1, refType);
         await VerifyImportItemExistsAsync(
              markup,
-             "ExtentionMethod",
+             "ExtensionMethod",
              glyph: Glyph.ExtensionMethodPublic,
              inlineDescription: "Foo");
     }
@@ -634,7 +634,7 @@ namespace Foo
             {
                 public static class ExtensionClass
                 {
-                    public static bool ExtentionMethod<T>(this T t)
+                    public static bool ExtensionMethod<T>(this T t)
                         => true;
                 }
             }
@@ -659,7 +659,7 @@ public void M({{type}} x)
         var markup = GetMarkup(file2, file1, refType);
         await VerifyImportItemExistsAsync(
              markup,
-             "ExtentionMethod",
+             "ExtensionMethod",
              displayTextSuffix: "<>",
              glyph: Glyph.ExtensionMethodPublic,
              inlineDescription: "Foo");
@@ -677,7 +677,7 @@ namespace Foo
             {
                 internal static class ExtensionClass
                 {
-                    public static bool ExtentionMethod(this int x)
+                    public static bool ExtensionMethod(this int x)
                         => true;
                 }
             }
@@ -700,7 +700,7 @@ public void M(int x)
         var markup = GetMarkup(file2, file1, refType);
         await VerifyImportItemIsAbsentAsync(
              markup,
-             "ExtentionMethod",
+             "ExtensionMethod",
              inlineDescription: "Foo");
     }
 
@@ -714,7 +714,7 @@ namespace Foo
             {
                 internal static class ExtensionClass
                 {
-                    internal static bool ExtentionMethod(this int x)
+                    internal static bool ExtensionMethod(this int x)
                         => true;
                 }
             }
@@ -737,7 +737,7 @@ public void M(int x)
         var markup = GetMarkup(file2, file1, ReferenceType.None);
         await VerifyImportItemExistsAsync(
              markup,
-             "ExtentionMethod",
+             "ExtensionMethod",
              glyph: Glyph.ExtensionMethodInternal,     // This is based on declared accessibility
              inlineDescription: "Foo");
     }
@@ -755,7 +755,7 @@ namespace Foo
             {
                 internal static class ExtensionClass
                 {
-                    internal static bool ExtentionMethod(this int x)
+                    internal static bool ExtensionMethod(this int x)
                         => true;
                 }
             }
@@ -776,7 +776,7 @@ public void M(int x)
         var markup = GetMarkup(file2, file1, refType);
         await VerifyImportItemExistsAsync(
              markup,
-             "ExtentionMethod",
+             "ExtensionMethod",
              glyph: Glyph.ExtensionMethodInternal,
              inlineDescription: "Foo");
     }
@@ -795,7 +795,7 @@ namespace Foo
             {
                 public static class ExtensionClass
                 {
-                    public static bool ExtentionMethod(this MyGeneric<int> x)
+                    public static bool ExtensionMethod(this MyGeneric<int> x)
                         => true;
                 }
             }
@@ -818,7 +818,7 @@ public void M(MyGeneric<int> x)
 
         await VerifyImportItemExistsAsync(
              markup,
-             "ExtentionMethod",
+             "ExtensionMethod",
              glyph: Glyph.ExtensionMethodPublic,
              inlineDescription: "Foo");
     }
@@ -835,7 +835,7 @@ namespace Foo
             {
                 public static class ExtensionClass
                 {
-                    public static bool ExtentionMethod(this int x)
+                    public static bool ExtensionMethod(this int x)
                         => true;
                 }
             }
@@ -858,7 +858,7 @@ public void M()
 
         await VerifyImportItemExistsAsync(
              markup,
-             "ExtentionMethod",
+             "ExtensionMethod",
              glyph: Glyph.ExtensionMethodPublic,
              inlineDescription: "Foo");
     }
@@ -902,7 +902,7 @@ Imports System.Runtime.CompilerServices
             Namespace NS
                 Public Module Foo
                     <Extension>
-                    public Function ExtentionMethod(x As {vbType}) As Boolean
+                    public Function ExtensionMethod(x As {vbType}) As Boolean
                         Return True
                     End Function
                 End Module
@@ -926,7 +926,7 @@ public void M({{csType}} x)
 
         await VerifyImportItemExistsAsync(
              markup,
-             "ExtentionMethod",
+             "ExtensionMethod",
              glyph: Glyph.ExtensionMethodPublic,
              inlineDescription: "NS");
     }
@@ -940,7 +940,7 @@ Imports System.Runtime.CompilerServices
 
             Public Module Foo
                 <Extension>
-                public Function ExtentionMethod(x As Integer) As Boolean
+                public Function ExtensionMethod(x As Integer) As Boolean
                     Return True
                 End Function
             End Module
@@ -963,7 +963,7 @@ public void M(int x)
 
         await VerifyImportItemExistsAsync(
              markup,
-             "ExtentionMethod",
+             "ExtensionMethod",
              glyph: Glyph.ExtensionMethodPublic,
              inlineDescription: "Root");
     }
@@ -977,7 +977,7 @@ Imports System.Runtime.CompilerServices
 
             Public Module Foo
                 <Extension>
-                public Function ExtentionMethod(x As Integer) As Boolean
+                public Function ExtensionMethod(x As Integer) As Boolean
                     Return True
                 End Function
             End Module
@@ -1000,7 +1000,7 @@ public void M(int x)
 
         await VerifyImportItemIsAbsentAsync(
              markup,
-             "ExtentionMethod",
+             "ExtensionMethod",
              inlineDescription: "");
     }
 
@@ -1014,7 +1014,7 @@ namespace Foo
             {
                 internal static class ExtensionClass
                 {
-                    internal static bool ExtentionMethod(this int x)
+                    internal static bool ExtensionMethod(this int x)
                         => true;
                 }
             }
@@ -1038,7 +1038,7 @@ public void M(int x)
         var markup = GetMarkup(file2, file1, ReferenceType.None);
         await VerifyImportItemExistsAsync(
              markup,
-             "ExtentionMethod",
+             "ExtensionMethod",
              glyph: Glyph.ExtensionMethodInternal,     // This is based on declared accessibility
              inlineDescription: "Foo");
     }
@@ -1183,7 +1183,7 @@ namespace Foo
             {
                 public static partial class ExtensionClass
                 {
-                    public static bool ExtentionMethod1(this string x)
+                    public static bool ExtensionMethod1(this string x)
                         => true;
                 }
             }
@@ -1195,7 +1195,7 @@ namespace Foo
             {
                 public static partial class ExtensionClass
                 {
-                    public static bool ExtentionMethod2(this string x)
+                    public static bool ExtensionMethod2(this string x)
                         => true;
                 }
             }
@@ -1216,13 +1216,13 @@ public void M(string x)
 
         await VerifyImportItemExistsAsync(
              markup,
-             "ExtentionMethod1",
+             "ExtensionMethod1",
              glyph: Glyph.ExtensionMethodPublic,
              inlineDescription: "Foo");
 
         await VerifyImportItemExistsAsync(
              markup,
-             "ExtentionMethod2",
+             "ExtensionMethod2",
              glyph: Glyph.ExtensionMethodPublic,
              inlineDescription: "Foo");
     }
@@ -1240,7 +1240,7 @@ namespace Foo
             {
                 {{accessibility}} static class ExtensionClass
                 {
-                    public static bool ExtentionMethod1(this int x)
+                    public static bool ExtensionMethod1(this int x)
                         => true;
                 }
             }
@@ -1252,7 +1252,7 @@ namespace Foo
             {
                 internal static class ExtensionClass
                 {
-                    public static bool ExtentionMethod2(this int x)
+                    public static bool ExtensionMethod2(this int x)
                         => true;
                 }
             }
@@ -1278,13 +1278,13 @@ public void M(int x)
 
         await VerifyImportItemExistsAsync(
              markup,
-             "ExtentionMethod1",
+             "ExtensionMethod1",
              glyph: Glyph.ExtensionMethodPublic,
              inlineDescription: "Foo");
 
         await VerifyImportItemExistsAsync(
              markup,
-             "ExtentionMethod2",
+             "ExtensionMethod2",
              glyph: Glyph.ExtensionMethodPublic,
              inlineDescription: "Foo");
     }
@@ -1299,7 +1299,7 @@ namespace Foo
             {
                 internal static class ExtensionClass
                 {
-                    public static bool ExtentionMethod1(this int x)
+                    public static bool ExtensionMethod1(this int x)
                         => true;
                 }
             }
@@ -1311,7 +1311,7 @@ namespace Foo
             {
                 internal static class ExtensionClass
                 {
-                    public static bool ExtentionMethod2(this int x)
+                    public static bool ExtensionMethod2(this int x)
                         => true;
                 }
             }
@@ -1335,13 +1335,13 @@ public void M(int x)
 
         await VerifyImportItemExistsAsync(
              markup,
-             "ExtentionMethod1",
+             "ExtensionMethod1",
              glyph: Glyph.ExtensionMethodPublic,
              inlineDescription: "Foo");
 
         await VerifyImportItemExistsAsync(
              markup,
-             "ExtentionMethod2",
+             "ExtensionMethod2",
              glyph: Glyph.ExtensionMethodPublic,
              inlineDescription: "Foo");
     }
@@ -1361,7 +1361,7 @@ namespace Foo
             {
                 {{containerAccessibility}} static class ExtensionClass
                 {
-                    {{methodAccessibility}} static bool ExtentionMethod(this int x)
+                    {{methodAccessibility}} static bool ExtensionMethod(this int x)
                         => true;
                 }
             }
@@ -1387,7 +1387,7 @@ public void M(int x)
         {
             await VerifyImportItemExistsAsync(
                  markup,
-                 "ExtentionMethod",
+                 "ExtensionMethod",
                  glyph: Glyph.ExtensionMethodPublic,
                  inlineDescription: "Foo");
         }
@@ -1395,20 +1395,20 @@ await VerifyImportItemExistsAsync(
         {
             await VerifyImportItemIsAbsentAsync(
                  markup,
-                 "ExtentionMethod",
+                 "ExtensionMethod",
                  inlineDescription: "Foo");
         }
     }
 
     [Theory]
-    [InlineData(ReferenceType.Project, "[]", "ExtentionMethod2")]
-    [InlineData(ReferenceType.Project, "[][]", "ExtentionMethod3")]
-    [InlineData(ReferenceType.Project, "[,]", "ExtentionMethod4")]
-    [InlineData(ReferenceType.Project, "[][,]", "ExtentionMethod5")]
-    [InlineData(ReferenceType.Metadata, "[]", "ExtentionMethod2")]
-    [InlineData(ReferenceType.Metadata, "[][]", "ExtentionMethod3")]
-    [InlineData(ReferenceType.Metadata, "[,]", "ExtentionMethod4")]
-    [InlineData(ReferenceType.Metadata, "[][,]", "ExtentionMethod5")]
+    [InlineData(ReferenceType.Project, "[]", "ExtensionMethod2")]
+    [InlineData(ReferenceType.Project, "[][]", "ExtensionMethod3")]
+    [InlineData(ReferenceType.Project, "[,]", "ExtensionMethod4")]
+    [InlineData(ReferenceType.Project, "[][,]", "ExtensionMethod5")]
+    [InlineData(ReferenceType.Metadata, "[]", "ExtensionMethod2")]
+    [InlineData(ReferenceType.Metadata, "[][]", "ExtensionMethod3")]
+    [InlineData(ReferenceType.Metadata, "[,]", "ExtensionMethod4")]
+    [InlineData(ReferenceType.Metadata, "[][,]", "ExtensionMethod5")]
     public async Task TestExtensionMethodsForSimpleArrayType(ReferenceType refType, string rank, string expectedName)
     {
         var refDoc = $$"""
@@ -1418,19 +1418,19 @@ namespace Foo
             {
                 public static class ExtensionClass
                 {
-                    public static bool ExtentionMethod1(this int x)
+                    public static bool ExtensionMethod1(this int x)
                         => true;
 
-                    public static bool ExtentionMethod2(this int[] x)
+                    public static bool ExtensionMethod2(this int[] x)
                         => true;
 
-                    public static bool ExtentionMethod3(this int[][] x)
+                    public static bool ExtensionMethod3(this int[][] x)
                         => true;
 
-                    public static bool ExtentionMethod4(this int[,] x)
+                    public static bool ExtensionMethod4(this int[,] x)
                         => true;
 
-                    public static bool ExtentionMethod5(this int[][,] x)
+                    public static bool ExtensionMethod5(this int[][,] x)
                         => true;
                 }
             }
@@ -1463,14 +1463,14 @@ await VerifyImportItemExistsAsync(
     }
 
     [Theory]
-    [InlineData(ReferenceType.Project, "[]", "ExtentionMethod2")]
-    [InlineData(ReferenceType.Project, "[][]", "ExtentionMethod3")]
-    [InlineData(ReferenceType.Project, "[,]", "ExtentionMethod4")]
-    [InlineData(ReferenceType.Project, "[][,]", "ExtentionMethod5")]
-    [InlineData(ReferenceType.Metadata, "[]", "ExtentionMethod2")]
-    [InlineData(ReferenceType.Metadata, "[][]", "ExtentionMethod3")]
-    [InlineData(ReferenceType.Metadata, "[,]", "ExtentionMethod4")]
-    [InlineData(ReferenceType.Metadata, "[][,]", "ExtentionMethod5")]
+    [InlineData(ReferenceType.Project, "[]", "ExtensionMethod2")]
+    [InlineData(ReferenceType.Project, "[][]", "ExtensionMethod3")]
+    [InlineData(ReferenceType.Project, "[,]", "ExtensionMethod4")]
+    [InlineData(ReferenceType.Project, "[][,]", "ExtensionMethod5")]
+    [InlineData(ReferenceType.Metadata, "[]", "ExtensionMethod2")]
+    [InlineData(ReferenceType.Metadata, "[][]", "ExtensionMethod3")]
+    [InlineData(ReferenceType.Metadata, "[,]", "ExtensionMethod4")]
+    [InlineData(ReferenceType.Metadata, "[][,]", "ExtensionMethod5")]
     public async Task TestExtensionMethodsForGenericArrayType(ReferenceType refType, string rank, string expectedName)
     {
         var refDoc = $$"""
@@ -1480,19 +1480,19 @@ namespace Foo
             {
                 public static class ExtensionClass
                 {
-                    public static bool ExtentionMethod1<T>(this T x)
+                    public static bool ExtensionMethod1<T>(this T x)
                         => true;
 
-                    public static bool ExtentionMethod2<T>(this T[] x)
+                    public static bool ExtensionMethod2<T>(this T[] x)
                         => true;
 
-                    public static bool ExtentionMethod3<T>(this T[][] x)
+                    public static bool ExtensionMethod3<T>(this T[][] x)
                         => true;
 
-                    public static bool ExtentionMethod4<T>(this T[,] x)
+                    public static bool ExtensionMethod4<T>(this T[,] x)
                         => true;
 
-                    public static bool ExtentionMethod5<T>(this T[][,] x)
+                    public static bool ExtensionMethod5<T>(this T[][,] x)
                         => true;
                 }
             }
@@ -1542,7 +1542,7 @@ namespace NS2
             {
                 public static class Extensions
                 {
-                    public static bool ExtentionMethod(this NS1.C1 c) => false;
+                    public static bool ExtensionMethod(this NS1.C1 c) => false;
                 }
             }
             """;
@@ -1568,7 +1568,7 @@ public void M<T>(T x) where T : C1
 
         await VerifyImportItemExistsAsync(
             markup,
-            "ExtentionMethod",
+            "ExtensionMethod",
             glyph: Glyph.ExtensionMethodPublic,
             inlineDescription: "NS2");
     }
@@ -1587,7 +1587,7 @@ namespace NS2
             {
                 public static class Extensions
                 {
-                    public static bool ExtentionMethod(this {{tupleType}}[] x) => false;
+                    public static bool ExtensionMethod(this {{tupleType}}[] x) => false;
                 }
             }
             """;
@@ -1613,7 +1613,7 @@ public void M({{tupleType}}[] x)
 
         await VerifyImportItemExistsAsync(
             markup,
-            "ExtentionMethod",
+            "ExtensionMethod",
             glyph: Glyph.ExtensionMethodPublic,
             inlineDescription: "NS2");
     }
@@ -1632,7 +1632,7 @@ namespace NS2
             {
                 public static class Extensions
                 {
-                    public static bool ExtentionMethod(this {{tupleType}} x) => false;
+                    public static bool ExtensionMethod(this {{tupleType}} x) => false;
                 }
             }
             """;
@@ -1658,7 +1658,7 @@ public void M({{tupleType}} x)
 
         await VerifyImportItemExistsAsync(
             markup,
-            "ExtentionMethod",
+            "ExtensionMethod",
             glyph: Glyph.ExtensionMethodPublic,
             inlineDescription: "NS2");
     }
@@ -1675,7 +1675,7 @@ namespace NS2
             {
                 public static class Extensions
                 {
-                    public static bool ExtentionMethod<T>(this T t) => false;
+                    public static bool ExtensionMethod<T>(this T t) => false;
                 }
             }
             """;
@@ -1701,11 +1701,11 @@ public void M(int x)
 
         await VerifyImportItemExistsAsync(
             markup,
-            "ExtentionMethod",
+            "ExtensionMethod",
             displayTextSuffix: "<>",
             glyph: Glyph.ExtensionMethodPublic,
             inlineDescription: "NS2",
-            expectedDescriptionOrNull: $"({CSharpFeaturesResources.extension}) bool int.ExtentionMethod<int>()");
+            expectedDescriptionOrNull: $"({CSharpFeaturesResources.extension}) bool int.ExtensionMethod<int>()");
     }
 
     [Theory]
@@ -1720,12 +1720,12 @@ namespace NS2
             {
                 public static class Extensions
                 {
-                    public static bool ExtentionMethod(this int t) => false;
-                    public static bool ExtentionMethod(this int t, int a) => false;
-                    public static bool ExtentionMethod(this int t, int a, int b) => false;
-                    public static bool ExtentionMethod<T>(this int t, T a) => false;
-                    public static bool ExtentionMethod<T>(this int t, T a, T b) => false;
-                    public static bool ExtentionMethod<T1, T2>(this int t, T1 a, T2 b) => false;
+                    public static bool ExtensionMethod(this int t) => false;
+                    public static bool ExtensionMethod(this int t, int a) => false;
+                    public static bool ExtensionMethod(this int t, int a, int b) => false;
+                    public static bool ExtensionMethod<T>(this int t, T a) => false;
+                    public static bool ExtensionMethod<T>(this int t, T a, T b) => false;
+                    public static bool ExtensionMethod<T1, T2>(this int t, T1 a, T2 b) => false;
                 }
             }
             """;
@@ -1751,18 +1751,18 @@ public void M(int x)
 
         await VerifyImportItemExistsAsync(
             markup,
-            "ExtentionMethod",
+            "ExtensionMethod",
             glyph: Glyph.ExtensionMethodPublic,
             inlineDescription: "NS2",
-            expectedDescriptionOrNull: $"({CSharpFeaturesResources.extension}) bool int.ExtentionMethod() (+{NonBreakingSpaceString}2{NonBreakingSpaceString}{FeaturesResources.overloads_})");
+            expectedDescriptionOrNull: $"({CSharpFeaturesResources.extension}) bool int.ExtensionMethod() (+{NonBreakingSpaceString}2{NonBreakingSpaceString}{FeaturesResources.overloads_})");
 
         await VerifyImportItemExistsAsync(
             markup,
-            "ExtentionMethod",
+            "ExtensionMethod",
             displayTextSuffix: "<>",
             glyph: Glyph.ExtensionMethodPublic,
             inlineDescription: "NS2",
-            expectedDescriptionOrNull: $"({CSharpFeaturesResources.extension}) bool int.ExtentionMethod<T>(T a) (+{NonBreakingSpaceString}2{NonBreakingSpaceString}{FeaturesResources.generic_overloads})");
+            expectedDescriptionOrNull: $"({CSharpFeaturesResources.extension}) bool int.ExtensionMethod<T>(T a) (+{NonBreakingSpaceString}2{NonBreakingSpaceString}{FeaturesResources.generic_overloads})");
     }
 
     [InlineData(ReferenceType.Project)]
@@ -1997,9 +1997,9 @@ namespace NS2
             {
                 public static class Extensions
                 {
-                    public static int ExtentionMethod(this int t, int a) => 0;
-                    public static int[] ExtentionMethod(this int t, int a, int b) => null;
-                    public static string ExtentionMethod(this int t, int a, int b, int c) => false;
+                    public static int ExtensionMethod(this int t, int a) => 0;
+                    public static int[] ExtensionMethod(this int t, int a, int b) => null;
+                    public static string ExtensionMethod(this int t, int a, int b, int c) => false;
                 }
             }
             """;
@@ -2028,12 +2028,12 @@ public void M(int x)
         if (matchTargetType)
         {
             expectedFilters.Add(FilterSet.TargetTypedFilter);
-            expectedDescription = $"({CSharpFeaturesResources.extension}) {targetType} int.ExtentionMethod({expectedParameterList}) (+{NonBreakingSpaceString}2{NonBreakingSpaceString}{FeaturesResources.overloads_})";
+            expectedDescription = $"({CSharpFeaturesResources.extension}) {targetType} int.ExtensionMethod({expectedParameterList}) (+{NonBreakingSpaceString}2{NonBreakingSpaceString}{FeaturesResources.overloads_})";
         }
 
         await VerifyImportItemExistsAsync(
             markup,
-            "ExtentionMethod",
+            "ExtensionMethod",
             expectedFilters: expectedFilters,
             inlineDescription: "NS2",
             expectedDescriptionOrNull: expectedDescription);
diff --git a/src/EditorFeatures/VisualBasicTest/Completion/CompletionProviders/ExtensionMethodImportCompletionProviderTests.vb b/src/EditorFeatures/VisualBasicTest/Completion/CompletionProviders/ExtensionMethodImportCompletionProviderTests.vb
index 4f414a5a54be8..c70d8afc1640c 100644
--- a/src/EditorFeatures/VisualBasicTest/Completion/CompletionProviders/ExtensionMethodImportCompletionProviderTests.vb
+++ b/src/EditorFeatures/VisualBasicTest/Completion/CompletionProviders/ExtensionMethodImportCompletionProviderTests.vb
@@ -200,7 +200,7 @@ Imports System.Runtime.CompilerServices
 Namespace NS
     Public Module Foo
         <Extension>
-        Public Function ExtentionMethod(x As Bar) As Boolean
+        Public Function ExtensionMethod(x As Bar) As Boolean
             Return True
         End Function
     End Module
@@ -220,7 +220,7 @@ Public Class Baz
 End Class]]></Text>.Value
 
             Dim markup = GetMarkup(file2, file1, refType)
-            Await VerifyItemIsAbsentAsync(markup, "ExtentionMethod", inlineDescription:="NS")
+            Await VerifyItemIsAbsentAsync(markup, "ExtensionMethod", inlineDescription:="NS")
         End Function
 
         <InlineData(ReferenceType.None)>
@@ -235,7 +235,7 @@ Imports System.Runtime.CompilerServices
 Namespace NS
     Public Module Foo
         <Extension>
-        Public Function ExtentionMethod(x As Bar) As Boolean
+        Public Function ExtensionMethod(x As Bar) As Boolean
             Return True
         End Function
     End Module
@@ -255,17 +255,17 @@ Public Class Baz
 End Class]]></Text>.Value
 
             Dim markup = GetMarkup(file2, file1, refType)
-            Await VerifyItemIsAbsentAsync(markup, "ExtentionMethod", inlineDescription:="NS")
+            Await VerifyItemIsAbsentAsync(markup, "ExtensionMethod", inlineDescription:="NS")
         End Function
 
-        <InlineData(ReferenceType.Project, "()", "ExtentionMethod2")>
-        <InlineData(ReferenceType.Project, "()()", "ExtentionMethod3")>
-        <InlineData(ReferenceType.Project, "(,)", "ExtentionMethod4")>
-        <InlineData(ReferenceType.Project, "()(,)", "ExtentionMethod5")>
-        <InlineData(ReferenceType.None, "()", "ExtentionMethod2")>
-        <InlineData(ReferenceType.None, "()()", "ExtentionMethod3")>
-        <InlineData(ReferenceType.None, "(,)", "ExtentionMethod4")>
-        <InlineData(ReferenceType.None, "()(,)", "ExtentionMethod5")>
+        <InlineData(ReferenceType.Project, "()", "ExtensionMethod2")>
+        <InlineData(ReferenceType.Project, "()()", "ExtensionMethod3")>
+        <InlineData(ReferenceType.Project, "(,)", "ExtensionMethod4")>
+        <InlineData(ReferenceType.Project, "()(,)", "ExtensionMethod5")>
+        <InlineData(ReferenceType.None, "()", "ExtensionMethod2")>
+        <InlineData(ReferenceType.None, "()()", "ExtensionMethod3")>
+        <InlineData(ReferenceType.None, "(,)", "ExtensionMethod4")>
+        <InlineData(ReferenceType.None, "()(,)", "ExtensionMethod5")>
         <Theory>
         Public Async Function TestExtensionMethodsForArrayType(refType As ReferenceType, rank As String, expectedName As String) As Task
 
@@ -276,23 +276,23 @@ Imports System.Runtime.CompilerServices
 Namespace NS
     Public Module Foo
         <Extension>
-        Public Function ExtentionMethod1(x As Integer) As Boolean
+        Public Function ExtensionMethod1(x As Integer) As Boolean
             Return True
         End Function
         <Extension>
-        Public Function ExtentionMethod2(x As Integer()) As Boolean
+        Public Function ExtensionMethod2(x As Integer()) As Boolean
             Return True
         End Function
         <Extension>
-        Public Function ExtentionMethod3(x As Integer()()) As Boolean
+        Public Function ExtensionMethod3(x As Integer()()) As Boolean
             Return True
         End Function
         <Extension>
-        Public Function ExtentionMethod4(x As Integer(,)) As Boolean
+        Public Function ExtensionMethod4(x As Integer(,)) As Boolean
             Return True
         End Function
         <Extension>
-        Public Function ExtentionMethod5(x As Integer()(,)) As Boolean
+        Public Function ExtensionMethod5(x As Integer()(,)) As Boolean
             Return True
         End Function
     End Module