There are already threads here discussing exactly that. Did you do a search?

For a bulk Find/Replace that uses an Excel workbook as the data source to process all documents in a folder, see: https://www.msofficeforums.com/word/...html#post34254. For an interactive version that processes just the active document, see: https://www.msofficeforums.com/word-...html#post31849. Later in the same thread there is a discussion on how to convert the interactive code to automatic replacement.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]