geological era vs geologic time

geological era and geologic time both are nouns.

Word	Noun	Adjective	Verb	Adverb
geological era	Yes	No	No	No
geologic time	Yes	No	No	No

As nouns, geologic time is a hypernym of geological era; that is, geologic time is a word with a broader meaning than geological era:

geological era: a major division of geological time; an era is usually divided into two or more periods
geologic time: the time of the physical formation and development of the earth (especially prior to human history)

Other hypernyms of geological era include geological time.

geological era (noun)	geologic time (noun)
a major division of geological time; an era is usually divided into two or more periods	the time of the physical formation and development of the earth (especially prior to human history)