For some code to do the interactive part, see:
https://www.msofficeforums.com/word-...html#post31849
For some code for the multi-document part, see:
https://www.msofficeforums.com/word-...cel-range.html
With the Excel workbook approach, there is no
practical limit to the # of words that can be searched for (the real limit in the above implementations is 1,048,576 search terms, but only because the macros aren't coded to work with more than one column of search terms ...).