A family of Microsoft word processing software products for creating web, email, and print documents.
Did you try an Online Repair, which was Estrella's first suggestion? See https://support.microsoft.com/en-us/office/lifecycle/repair-an-office-application.
Before you begin, note that an Online Repair usually requires a reinstall (it is the final step in the process), and therefore you should make sure that you can access your Office account at https://account.microsoft.com/services and that your Office product (subscription or one-time payment license) is associated with it.