/ Thesaurus / R Synonyms of river otter Find synonyms for: Noun1. river otter, Lutra canadensis, otterusage: sociable aquatic animal widely distributed along streams and lake borders in North AmericaWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language