meadowgrass vs family Graminaceae

meadowgrass and family Graminaceae both are nouns.

Word	Noun	Adjective	Verb	Adverb
meadowgrass	Yes	No	No	No
family Graminaceae	Yes	No	No	No

meadowgrass (noun)	family Graminaceae (noun)
any of various grasses that thrive in the presence of abundant moisture	the grasses: chiefly herbaceous but some woody plants including cereals, bamboo, reeds, sugar cane