/ Thesaurus / S Synonyms of salt water Find synonyms for: Noun1. seawater, saltwater, brine, water, H2Ousage: water containing salts; "the water in the ocean is all saltwater"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: acerbity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language