If you have Beyond Compare, you can diff two word documents with the help of some rules that you have to download from the developer's site and plugin. It'll then give you a text-only (without formatting) view (with some word format-gibberish that you can ignore. The differences will be highlighted and easy to find.
I made a note on how to do it here. It talks about Excel but there is a rule for Word in the same place.
If you don't have Beyond Compare... buy it! Highly recommended.. I'd struggle without it.
