Archean eon vs Archean

Archean eon and Archean both are nouns.

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

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

Archean eon and Archean: 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 eon include Archaeozoic, Archaeozoic aeon, Archean aeon, Archeozoic, Archeozoic eon.

Archean eon (noun)	Archean (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