/ Thesaurus / P Synonyms of perennial ryegrass Find synonyms for: Noun1. perennial ryegrass, English ryegrass, Lolium perenne, rye grass, ryegrassusage: European perennial grass widely cultivated for pasture and hay and as a lawn grassWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: opulent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language