/ Thesaurus / O Synonyms of outboard motor Find synonyms for: Noun1. outboard motor, outboard, internal-combustion engine, ICEusage: internal-combustion engine that mounts at stern of small boatWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language