I'm still not following you -- I searched Adobe's site up and down, and failed to find a version of Adobe Type Reunion that runs under OS X. The latest version they offer was released back in the days of OS 8.1.
Perhaps you're running Adobe Type Reunion in Classic mode for some applications that run under OS 9, not OS X. In that case, no, Type Reunion will not work under Word X, because Type Reunion only affects applications that run along with it in the Classic environment... is this what you're saying?