/ Thesaurus / S Synonyms of sea mouse Find synonyms for: Noun1. sea mouse, polychaete, polychete, polychaete worm, polychete wormusage: any of several large worms having a broad flattened body with a mat of coarse hairs covering the backWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: illegible Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language