/ Thesaurus / A Synonyms of archean aeon Find synonyms for: Noun1. Archean, Archean eon, Archean aeon, Archeozoic, Archaeozoic, Archeozoic eon, Archaeozoic aeonusage: the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of lifeWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language