Hi, Davey,
Word just uses whatever fonts are installed for Windows. (A small caveat:
you must choose a printer other than "Generic/Text" in order for Word to
recognize TrueType fonts.)
Use
www.google.com to search for fonts. There are hundreds of sites where
you can download them. Some are commercial (pay before downloading), some
are shareware (try before you buy), and some are free. It helps to have some
idea of what you're looking for in order to narrow your search, lest you be
inundated with hundreds of thousands of links.