expression.MatchWholeWord
expression Required. An expression that returns a Find object.
Remarks
Use the Text property of the Find object or the FindText argument with the Execute method to specify the text to be located in a document.
Example
This example clears all formatting from the find and replace criteria before replacing the word "Inc." with "incorporated" throughout the active document.
With ActiveDocument.Content.Find
.ClearFormatting
.Replacement.ClearFormatting
.MatchWholeWord = True
.Execute FindText:="Inc.", _
ReplaceWith:="incorporated", Replace:=wdReplaceAll
End With