sell someone out vs grass

sell someone out is not a noun while grass is a noun.

Word	Noun	Adjective	Verb	Adverb
sell someone out	No	No	Yes	No
grass	Yes	No	Yes	No

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

Other hypernyms of sell someone out include betray, denounce, give away, rat, shit, shop, snitch, stag, tell on.

sell someone out (noun)	grass (noun)
	street names for marijuana
	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

sell someone out (verb)	grass (verb)
give information that compromises others	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