family Poaceae vs genus Setaria

family Poaceae and genus Setaria both are nouns.

Word	Noun	Adjective	Verb	Adverb
family Poaceae	Yes	No	No	No
genus Setaria	Yes	No	No	No

family Poaceae (noun)	genus Setaria (noun)
the grasses: chiefly herbaceous but some woody plants including cereals, bamboo, reeds, sugar cane	annual or perennial grasses of warm regions: bristlegrasses