/ Thesaurus / R Synonyms of red giant star Find synonyms for: Noun1. red giant, red giant star, starusage: a large, old, luminous star; has a relatively low surface temperature and a diameter large relative to the sunWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: penurious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language