grandmaster vs player

grandmaster and player both are nouns.

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

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

grandmaster: a player of exceptional or world class skill in chess or bridge
player: a person who participates in or is skilled at some game

Other hypernyms of grandmaster include participant.

grandmaster (noun)	player (noun)
a player of exceptional or world class skill in chess or bridge	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