goalkeeper vs player

goalkeeper and player both are nouns.

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

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

Other hypernyms of goalkeeper include athlete, jock, participant.

goalkeeper (noun)	player (noun)
the defensive position on an ice hockey or soccer or lacrosse team who stands in front of the goal and tries to prevent opposing players from scoring	a theatrical performer
the soccer or hockey player assigned to protect the goal	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