Olympian vs jock

Olympian and jock both are nouns.

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

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

Other hypernyms of Olympian include athlete.

Olympian (noun)	jock (noun)
an athlete who participates in the Olympic games	a support for the genitals worn by men engaging in strenuous exercise
a classical Greek god after the overthrow of the Titans	a person trained to compete in sports

Olympian (adjective)	jock (adjective)
of or pertaining to the greater gods of ancient Greece whose abode was Mount Olympus
of the region of Olympia in Greece or its inhabitants