player vs instrumentalist

player and instrumentalist both are nouns.

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

As nouns, player and instrumentalist are synonyms defined as:

Other synonyms of player include musician.

player (noun)	instrumentalist (noun)
a theatrical performer	someone who plays a music as a profession
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