family Gramineae vs grass family

family Gramineae and grass family both are nouns.

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

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

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

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

family Gramineae (noun)	grass family (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