pasture vs grass

pasture and grass both are nouns.

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

As nouns, pasture and grass are synonyms defined as:

pasture and grass: bulky food like grass or hay for browsing or grazing horses or cattle

Other synonyms of pasture include eatage, forage, pasturage.

As verbs, grass is a hyponym of pasture; that is, grass is a word with a more specific, narrower meaning than pasture:

Other hyponyms of pasture include drift.

pasture (noun)	grass (noun)
bulky food like grass or hay for browsing or grazing horses or cattle	street names for marijuana
a field covered with grass or herbage and suitable for grazing by livestock	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

pasture (verb)	grass (verb)
feed as in a meadow or pasture	give away information about somebody
let feed in a field or pasture or meadow	shoot down, of birds
	feed with grass
	cover with grass
	spread out clothes on the grass to let it dry and bleach