/ Thesaurus / O Synonyms of on board Find synonyms for: Adverb1. aboard, on boardusage: on a ship, train, plane or other vehicleWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: ontiguous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language