/ Thesaurus / W Synonyms of water horsetail Find synonyms for: Noun1. swamp horsetail, water horsetail, Equisetum fluviatile, horsetailusage: Eurasia; northern North America to VirginiaWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: pudgy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language