hypermedia vs multimedia

hypermedia and multimedia both are nouns.

Word	Noun	Adjective	Verb	Adverb
hypermedia	Yes	No	No	No
multimedia	Yes	No	No	No

As nouns, multimedia is a hypernym of hypermedia; that is, multimedia is a word with a broader meaning than hypermedia:

hypermedia: a multimedia system in which related items of information are connected and can be presented together
multimedia: transmission that combine media of communication (text and graphics and sound etc.)

Other hypernyms of hypermedia include multimedia system.

hypermedia (noun)	multimedia (noun)
a multimedia system in which related items of information are connected and can be presented together	transmission that combine media of communication (text and graphics and sound etc.)