Hi,
For most operating systems, you can double click the font files and the operating system (windows/macOS) will ask you if you want to install it.
It will show up in Microsoft word afterwards in the Font selection. Sometimes Microsoft has the list split, so you may have to scroll towards the end to see it.
If Microsoft Word was open when installing the font, you might have to quit and re-open Microsoft Word.
For website based editors, like Google Docs and the online version of Word, you are generally limited to the options they give you. Google only allows fonts from Google fonts, and Microsoft has their own set of fonts that can be chosen.