jumper vs jock

jumper and jock both are nouns.

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

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

Other hypernyms of jumper include athlete.

jumper (noun)	jock (noun)
(basketball) a player releases the basketball at the high point of a jump	a support for the genitals worn by men engaging in strenuous exercise
a sleeveless dress resembling an apron; worn over other clothing	a person trained to compete in sports
a loose jacket or blouse worn by workmen
a small connector used to make temporary electrical connections
a coverall worn by children
a crocheted or knitted garment covering the upper part of the body
an athlete who competes at jumping
a person who jumps