downy bromegrass vs downy brome

downy bromegrass and downy brome both are nouns.

Word	Noun	Adjective	Verb	Adverb
downy bromegrass	Yes	No	No	No
downy brome	Yes	No	No	No

As nouns, downy bromegrass and downy brome are synonyms defined as:

downy bromegrass and downy brome: annual or winter annual grass with softly hairy leaves of the Mediterranean

Other synonyms of downy bromegrass include Bromus tectorum, cheatgrass, downy cheat, downy chess, drooping brome.

downy bromegrass (noun)	downy brome (noun)
annual or winter annual grass with softly hairy leaves of the Mediterranean	annual or winter annual grass with softly hairy leaves of the Mediterranean