pool player vs player

pool player and player both are nouns.

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

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

Other hypernyms of pool player include participant.

pool player (noun)	player (noun)
someone who shoots pool	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