accompanyist vs musician

accompanyist and musician both are nouns.

Word	Noun	Adjective	Verb	Adverb
accompanyist	Yes	No	No	No
musician	Yes	No	No	No

As nouns, musician is a hypernym of accompanyist; that is, musician is a word with a broader meaning than accompanyist:

accompanyist: a person who provides musical accompaniment (usually on a piano)
musician: someone who plays a music as a profession

Other hypernyms of accompanyist include instrumentalist, player.

accompanyist (noun)	musician (noun)
a person who provides musical accompaniment (usually on a piano)	artist who composes or conducts music as a profession
	someone who plays a music as a profession