A family of Microsoft word processing software products for creating web, email, and print documents.
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On the Home tab click the Add-ins tool then click the More Add-ins button at the bottom of the dialog window. On the My Add-ins page either right-click the one you want to get rid of & select the Remove command or select the one to eliminate then click the ellipsis [...] to access the Remove command there.
However, that only pertains to Add-in obtained from the Microsoft Store. If it is some other type of 3rd party add-in go to Tool> Templates and Add-Ins in the main menu bar, select the add-in then click the ➖ below the list.
If you still have a problem please provide descriptive details identifying exactly what you are trying to remove. Be sure to also include the present Version Number & type of License for the Office software as indicated in Word> About Microsoft Word.