/ Thesaurus / M Synonyms of mackinaw boat Find synonyms for: Noun1. mackinaw, Mackinaw boat, boatusage: a flat-bottomed boat used on upper Great LakesWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: buoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language