meadowgrass vs family Poaceae

meadowgrass and family Poaceae both are nouns.

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

meadowgrass (noun)	family Poaceae (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