accompanyist vs player

accompanyist and player both are nouns.

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

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

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

Other hypernyms of accompanyist include instrumentalist, musician.

accompanyist (noun)	player (noun)
a person who provides musical accompaniment (usually on a piano)	a theatrical performer
	a person who participates in or is skilled at some game
	someone who plays a music as a profession
	a person who pursues a number of different social and sexual partners simultaneously
	someone who takes part in an activity