multimedia system vs multimedia

multimedia system and multimedia both are nouns.

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

As nouns, multimedia system and multimedia are synonyms defined as:

multimedia system and multimedia: transmission that combine media of communication (text and graphics and sound etc.)

multimedia system (noun)	multimedia (noun)
transmission that combine media of communication (text and graphics and sound etc.)	transmission that combine media of communication (text and graphics and sound etc.)