/ Thesaurus / W Synonyms of water parsnip Find synonyms for: Noun1. water parsnip, Sium suave, marsh plant, bog plant, swamp plantusage: stout white-flowered perennial found wild in shallow fresh water; northern United States and AsiaWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: aversion Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language