/ Thesaurus / C Synonyms of co star Find synonyms for: Noun1. co-star, star, principal, leadusage: one of two actors who are given equal status as stars in a play or filmVerb1. co-star, starusage: feature as the co-star in a performance2. co-star, starusage: be the co-star in a performanceWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: pedagogy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language