A family of Microsoft word processing software products for creating web, email, and print documents.
Microsoft is aware of the problem and is investigating.
If you can get Word to run, please use the Help menu and choose Feedback > I Don't Like Something. That sends metrics about Word to Microsoft so they can gather data to analyze this issue.
You might try using Quit (Command-Q) of all open Microsoft Applications and then relaunch Word a couple times. That fixed the problem for some (but not most).