agon vs Olympian Games

agon and Olympian Games both are nouns.

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

As nouns, Olympian Games is a hyponym of agon; that is, Olympian Games is a word with a more specific, narrower meaning than agon:

agon: a festivity in ancient Greece at which competitors contended for prizes
Olympian Games: the ancient Panhellenic celebration at Olympia in honor of Zeus; held every 4 years beginning in 776 BC

Other hyponyms of agon include Isthmian Games, Nemean Games, Olympic Games, Pythian Games.

agon (noun)	Olympian Games (noun)
a festivity in ancient Greece at which competitors contended for prizes	the ancient Panhellenic celebration at Olympia in honor of Zeus; held every 4 years beginning in 776 BC