A family of Microsoft word processing software products for creating web, email, and print documents.
Trust me, as a seasoned writer, you do NOT want to get rid of AutoText or QuickParts.
You do want to get rid of the suggestions that Microsoft is foisting off on you, though.
This is primarily in Windows, rather than Word.
I am assuming that as a writer you are using the desktop application, not the browser program named Word.
You can, in Word, turn off the AutoComplete feature for AutoText (and other building blocks). This is an advanced option.
First, though, try simply unchecking the option for text predictions. I suspect that is the Word feature causing problems.