agon vs Olympic Games

agon and Olympic Games both are nouns.

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

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

agon: a festivity in ancient Greece at which competitors contended for prizes
Olympic 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, Olympian Games, Pythian Games.

agon (noun)	Olympic 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
	the modern revival of the ancient games held once every 4 years in a selected country