/ Thesaurus / F Synonyms of fire hydrant Find synonyms for: Noun1. fireplug, fire hydrant, plug, hydrantusage: an upright hydrant for drawing water to use in fighting a fireWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: dormant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language