Word for Mac, at least the version I have, is standard configured to autosaves yourr changes every ten minutes. It does that at a location that is specified under your preferences (command+,) for word. The problem is that these files get deleted if you close Word in a proper way. That is, when you say no to “save or not save?” at the terminating the program.
I couldn’t find anything on the net about it, but maybe you can look in that directory (standard setting is your documents folder) and start time machine if you have that setup. You may then restore it and word will start up with the document next time you start it up.
Otherwise, you will have to retype. I sincerely feel for you.I have done that and been there as well.