Microsoft Word's Find and Replace utility is a powerful tool that allows users to quickly search through their documents for specific words and phrases. Another use of this tool is to find duplicate words in a body of text using the highlight option, which displays repeated words so that you can easily review and edit the text to eliminate word repetition.
Click the "Find" menu on the "Home" tab of the Ribbon and select "Advanced Find."
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Enter the word you wish to find duplicates of into the "Find What" input box.
Select other options in the "Search Options" section as needed; using search options such as "Match Case" and "Find Whole Words Only" makes your search more specific.
Click the "Reading Highlight" menu and click "Highlight All."