/ Thesaurus / O Synonyms of osage river Find synonyms for: Noun1. Osage, Osage Riverusage: a river in Missouri that is a tributary of the Missouri RiverWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: ontiguous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language