/ Thesaurus / N Synonyms of neosho river Find synonyms for: Noun1. Neosho, Neosho Riverusage: a river that rises in eastern Kansas and flows eastward into Oklahoma to become a tributary of the Arkansas RiverWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language