family Gramineae vs graminaceous plant

family Gramineae and graminaceous plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
family Gramineae	Yes	No	No	No
graminaceous plant	Yes	No	No	No

family Gramineae (noun)	graminaceous plant (noun)
the grasses: chiefly herbaceous but some woody plants including cereals, bamboo, reeds, sugar cane	cosmopolitan herbaceous or woody plants with hollow jointed stems and long narrow leaves