instrumentalist vs musician

instrumentalist and musician both are nouns.

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

As nouns, instrumentalist and musician are synonyms defined as:

Other synonyms of instrumentalist include player.

instrumentalist (noun)	musician (noun)
someone who plays a music as a profession	artist who composes or conducts music as a profession
	someone who plays a music as a profession