I’m thinking of this as part of revision, but it might be useful in other ways as well: highlight text in Word, go to View, then Toolbars, then Speech. Click on Speak Selection in the small window that appears.

Listen to your work. Revise when you don’t like what you hear.

There are bound to be other ways to do this as well. Macs have a VoiceOver Utility under Universal Access in System Preferences, for example.