soccer player vs jock

soccer player and jock both are nouns.

Word	Noun	Adjective	Verb	Adverb
soccer player	Yes	No	No	No
jock	Yes	No	No	No

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

Other hypernyms of soccer player include athlete, participant, player.

soccer player (noun)	jock (noun)
an athlete who plays soccer	a support for the genitals worn by men engaging in strenuous exercise
	a person trained to compete in sports