Fonts aren't in Word, they're in Windows. You can go to Start >
Control Panel > Fonts, right-click on a font name, and choose
Uninstall. (I think this deletes the font from the Fonts folder
entirely, so if you want to get it back some day, be sure to keep a
copy somewhere else. When you want it back, right-click on the font
name in your storage location and choose Install.)
Wait .. I don't know what "font file" and "control menu" are -- are
you perhaps on a Mac?