family Poaceae vs Bouteloua

family Poaceae and Bouteloua both are nouns.

Word	Noun	Adjective	Verb	Adverb
family Poaceae	Yes	No	No	No
Bouteloua	Yes	No	No	No

family Poaceae (noun)	Bouteloua (noun)
the grasses: chiefly herbaceous but some woody plants including cereals, bamboo, reeds, sugar cane	forage grasses