/ Thesaurus / S Synonyms of sea otter Find synonyms for: Noun1. sea otter, Enhydra lutris, musteline mammal, mustelid, mustelineusage: large marine otter of northern Pacific coasts having very thick dark brown furWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: acerbity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language