piano player vs player

piano player and player both are nouns.

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

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

Other hypernyms of piano player include instrumentalist, musician.

piano player (noun)	player (noun)
a person who plays the 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