/ Thesaurus / L Synonyms of looker on Find synonyms for: Noun1. onlooker, looker-on, spectator, witness, viewer, watcher, lookerusage: someone who looks onWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: tenacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language