genus Agrostis vs family Graminaceae

genus Agrostis and family Graminaceae both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Agrostis	Yes	No	No	No
family Graminaceae	Yes	No	No	No

genus Agrostis (noun)	family Graminaceae (noun)
annual or perennial grasses cosmopolitan in Northern Hemisphere: bent grass (so named from `bent' meaning an area of unfenced grassland)	the grasses: chiefly herbaceous but some woody plants including cereals, bamboo, reeds, sugar cane