/ Thesaurus / F Synonyms of firth of clyde Find synonyms for: Noun1. Firth of Clydeusage: a firth on the southwestern coast of Scotland emptying into the North ChannelWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: tenacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language