accompanyist vs accompanist

accompanyist and accompanist both are nouns.

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

As nouns, accompanyist and accompanist are synonyms defined as:

accompanyist and accompanist: a person who provides musical accompaniment (usually on a piano)

accompanyist (noun)	accompanist (noun)
a person who provides musical accompaniment (usually on a piano)	a person who provides musical accompaniment (usually on a piano)