meadowgrass vs Gramineae

meadowgrass and Gramineae both are nouns.

Word	Noun	Adjective	Verb	Adverb
meadowgrass	Yes	No	No	No
Gramineae	Yes	No	No	No

meadowgrass (noun)	Gramineae (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