grass vs pasture

grass and pasture both are nouns.

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

As nouns, grass and pasture are synonyms defined as:

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

Other synonyms of grass include eatage, forage, pasturage.

As verbs, pasture is a hypernym of grass; that is, pasture is a word with a broader meaning than grass:

Other hypernyms of grass include crop, graze.

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

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