Nemean Games vs agon

Nemean Games and agon both are nouns.

Word	Noun	Adjective	Verb	Adverb
Nemean Games	Yes	No	No	No
agon	Yes	No	No	No

As nouns, agon is a hypernym of Nemean Games; that is, agon is a word with a broader meaning than Nemean Games:

Nemean Games: the ancient Panhellenic games held biennially at Nemea in the second and fourth years of each Olympiad
agon: a festivity in ancient Greece at which competitors contended for prizes

Nemean Games (noun)	agon (noun)
the ancient Panhellenic games held biennially at Nemea in the second and fourth years of each Olympiad	a festivity in ancient Greece at which competitors contended for prizes