goalkeeper vs jock

goalkeeper and jock both are nouns.

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

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

Other hypernyms of goalkeeper include athlete, participant, player.

goalkeeper (noun)	jock (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 support for the genitals worn by men engaging in strenuous exercise
the soccer or hockey player assigned to protect the goal	a person trained to compete in sports