grass family vs family Gramineae

grass family and family Gramineae both are nouns.

Word	Noun	Adjective	Verb	Adverb
grass family	Yes	No	No	No
family Gramineae	Yes	No	No	No

As nouns, grass family and family Gramineae are synonyms defined as:

grass family and family Gramineae: the grasses: chiefly herbaceous but some woody plants including cereals, bamboo, reeds, sugar cane

Other synonyms of grass family include family Graminaceae, family Poaceae, Graminaceae, Gramineae, Poaceae.

grass family (noun)	family Gramineae (noun)
the grasses: chiefly herbaceous but some woody plants including cereals, bamboo, reeds, sugar cane	the grasses: chiefly herbaceous but some woody plants including cereals, bamboo, reeds, sugar cane