pole jumper vs jock

pole jumper and jock both are nouns.

Word	Noun	Adjective	Verb	Adverb
pole jumper	Yes	No	No	No
jock	Yes	No	No	No

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

pole jumper: an athlete who jumps over a high crossbar with the aid of a long pole
jock: a person trained to compete in sports

Other hypernyms of pole jumper include athlete.

pole jumper (noun)	jock (noun)
an athlete who jumps over a high crossbar with the aid of a long pole	a support for the genitals worn by men engaging in strenuous exercise
	a person trained to compete in sports