/ Thesaurus / T Synonyms of tigris river Find synonyms for: Noun1. Tigris, Tigris Riverusage: an Asian river; a tributary of the Euphrates RiverWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: grimace Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language