/ Thesaurus / O Synonyms of o'brien Find synonyms for: Noun1. O'Brien, Edna O'Brienusage: Irish writer (born in 1932)WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language