geological time vs eon

geological time and eon both are nouns.

Word	Noun	Adjective	Verb	Adverb
geological time	Yes	No	No	No
eon	Yes	No	No	No

As nouns, eon is a hyponym of geological time; that is, eon is a word with a more specific, narrower meaning than geological time:

geological time: the time of the physical formation and development of the earth (especially prior to human history)
eon: the longest division of geological time

Other hyponyms of geological time include aeon, geological period, period, era, geological era, epoch.

geological time (noun)	eon (noun)
the time of the physical formation and development of the earth (especially prior to human history)	(Gnosticism) a divine power or nature emanating from the Supreme Being and playing various roles in the operation of the universe
	an immeasurably long period of time
	the longest division of geological time