/ Thesaurus / S Synonyms of st. lawrence river Find synonyms for: Noun1. Saint Lawrence, Saint Lawrence River, St. Lawrence, St. Lawrence Riverusage: a North American river; flows into the Gulf of Saint Lawrence and the North AtlanticWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: languid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language