buffalo grass vs grass

buffalo grass and grass both are nouns.

Word	Noun	Adjective	Verb	Adverb
buffalo grass	Yes	No	No	No
grass	Yes	No	Yes	No

As nouns, grass is a hypernym of buffalo grass; that is, grass is a word with a broader meaning than buffalo grass:

buffalo grass: short grass growing on dry plains of central United States (where buffalo roam)
grass: narrow-leaved green herbage: grown as lawns; used as pasture for grazing animals; cut and dried as hay

As nouns, grass is a hypernym of buffalo grass; that is, grass is a word with a broader meaning than buffalo grass:

buffalo grass: low mat-forming grass of southern United States and tropical America; grown as a lawn grass
grass: narrow-leaved green herbage: grown as lawns; used as pasture for grazing animals; cut and dried as hay

buffalo grass (noun)	grass (noun)
short grass growing on dry plains of central United States (where buffalo roam)	street names for marijuana
low mat-forming grass of southern United States and tropical America; grown as a lawn grass	bulky food like grass or hay for browsing or grazing horses or cattle
	a police informer who implicates many people
	narrow-leaved green herbage: grown as lawns; used as pasture for grazing animals; cut and dried as hay

buffalo grass (verb)	grass (verb)
	give away information about somebody
	shoot down, of birds
	feed with grass
	cover with grass
	spread out clothes on the grass to let it dry and bleach