Bouteloua gracilis vs blue grama

Bouteloua gracilis and blue grama both are nouns.

Word	Noun	Adjective	Verb	Adverb
Bouteloua gracilis	Yes	No	No	No
blue grama	Yes	No	No	No

As nouns, Bouteloua gracilis and blue grama are synonyms defined as:

Bouteloua gracilis and blue grama: a pasture grass of western North America

Bouteloua gracilis (noun)	blue grama (noun)
a pasture grass of western North America	a pasture grass of western North America