/ Thesaurus / R Synonyms of river severn Find synonyms for: Noun1. Severn, River Severn, Severn Riverusage: a river in England and Wales flowing into the Bristol Channel; the longest river in Great BritainWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: abscond Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language