A family of Microsoft word processing software products for creating web, email, and print documents.
Please use System Settings>Users & Groups to create a new user account. Then sign in to that account and see if Word works correctly. If it does, there is a problem with the Office installation in your normal account.
If the problems continue, please uninstall following these steps: Uninstall Office for Mac Then reinstall Office from the Subscriptions page of your Microsoft account.