Just to get the ball rolling, do you know what version of Word they're using?
I have Office 2001 running on my OS 9 system and have had all sorts of strange problems (the main menu completely disappears in Word, for example). I can't remember whether this is the case or not with Office but most Microsoft applications of this era have a 'First Run' feature that reinstalls all the shared components if they're missing, so you could try moving any obviously important-looking Microsoft Word components into a different folder (temporarily) and seeing if the applications reinstalls itself. This is certainly the case with Internet Explorer anyway.
HTH,
dodginess