jock vs contestant

jock and contestant both are nouns.

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

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

jock (noun)	contestant (noun)
a support for the genitals worn by men engaging in strenuous exercise	a person who participates in competitions
a person trained to compete in sports	a person who dissents from some established policy