Word allows you to use a concordance document for the creation of Index entries, via References|Insert Index>Automark. You could add your list to such a document.

The Index concordance document is essentially a two-column table in which the texts to be indexed is in the first column and the form of the Index entries is in the second column. However, see: https://wordmvp.com/FAQs/Formatting/CreateIndex.htm

Once the entries are marked, see: https://support.office.com/en-us/art...2-cda9d14bf073

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]

Thanks! Your links were very helpful. And the Concordance Index approach is going to work really well for our needs. We do actually want all the occurrences for each word to appear in the index, and the Concordance Index approach provides for this as well as allowing us to batch enter the words.