Archean vs Archean aeon

Archean and Archean aeon both are nouns.

Word	Noun	Adjective	Verb	Adverb
Archean	Yes	No	No	No
Archean aeon	Yes	No	No	No

As nouns, Archean and Archean aeon are synonyms defined as:

Archean and Archean aeon: the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life

Other synonyms of Archean include Archaeozoic, Archaeozoic aeon, Archean eon, Archeozoic, Archeozoic eon.

Archean (noun)	Archean aeon (noun)
the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life	the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life