/ Thesaurus / R Synonyms of rye grass Find synonyms for: Noun1. rye grass, ryegrass, grassusage: any of several annual or perennial Eurasian grassesWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: beseech Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language