A family of Microsoft word processing software products for creating web, email, and print documents.
Judging by the high number of view of this question, it is affecting a lot of people.
If this is hurting your work flow, you can restore the previous month's build of Microsoft Word using Time Machine. Simply restore the Microsoft Word.app in the Applications folder using the previous month's build.
Learn how to use Time Machine to restore specific files
You might use the Menu Bar and choose Help > Check for Updates and set AutoUpdate to Manual until this is resolved in a future update of Microsoft Word.