Another way might be to pick some kind of special formatting that is not
found anywhere else in your document (bold, underline, different font,
etc.). Then you can record a macro as follows:
Close Word, then reopen.
Have only your original doc open.
Open a new doc, the go back to the original.
With the cursor at the very start of your original doc, start the macro
recorder. Give your macro a name you will remember and associate with this
function.
Hit Ctrl+F
Leave the "Find What" box blank; click "More" and then "Format" and select
the format(s) you applied to your acronyms.
Click "Find Next"
When it stops on the first one, click into the document, but don't close the
Find box.
Hit Ctrl+C , Alt+Tab, Ctrl+V, Enter, Alt+Tab
Stop the recorder.
Check it by closing the Find box, going back to the top of the doc, and
running your macro (Alt+F8, select from list). If it works, we can help you
adjust that to cycle through the whole doc until it find everything.
Ed