Bromus tectorum vs drooping brome

Bromus tectorum and drooping brome both are nouns.

Word	Noun	Adjective	Verb	Adverb
Bromus tectorum	Yes	No	No	No
drooping brome	Yes	No	No	No

As nouns, Bromus tectorum and drooping brome are synonyms defined as:

Bromus tectorum and drooping brome: annual or winter annual grass with softly hairy leaves of the Mediterranean

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

Bromus tectorum (noun)	drooping 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