/ Thesaurus / E Synonyms of endangered species Find synonyms for: Noun1. endangered species, speciesusage: a species whose numbers are so small that the species is at risk of extinctionWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: nefarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language