You can use speech-to-text on Microsoft Word through the "Dictate" feature, which lets you write using your own voice.

You can use the speech-to-text feature on Windows to dictate text in any window, document, or field that you could ordinarily ...

I'll show you how to transcribe audio to text in Microsoft Word using two simple methods. You’ll learn how to use the Dictate and Transcribe tools built right into Word—no extra software needed.