tell on vs grass

tell on is not a noun while grass is a noun.

Word	Noun	Adjective	Verb	Adverb
tell on	No	No	Yes	No
grass	Yes	No	Yes	No

As verbs, tell on and grass are synonyms defined as:

Other synonyms of tell on include betray, denounce, give away, rat, shit, shop, snitch, stag.

tell on (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

tell on (verb)	grass (verb)
produce an effect or strain on somebody	give away information about somebody
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