Bromus tectorum vs downy bromegrass

Bromus tectorum and downy bromegrass both are nouns.

Word	Noun	Adjective	Verb	Adverb
Bromus tectorum	Yes	No	No	No
downy bromegrass	Yes	No	No	No

As nouns, Bromus tectorum and downy bromegrass are synonyms defined as:

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

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

Bromus tectorum (noun)	downy bromegrass (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