grass vs rat

grass and rat both are nouns.

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

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

grass: a police informer who implicates many people
rat: one who reveals confidential information to the police or other authority

Other hypernyms of grass include betrayer, blabber, informer, squealer.

As verbs, grass and rat are synonyms defined as:

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

grass (noun)	rat (noun)
street names for marijuana	any of various long-tailed rodents similar to but larger than a mouse
bulky food like grass or hay for browsing or grazing horses or cattle	a pad (usually made of hair) worn as part of a woman's coiffure
a police informer who implicates many people	a person who is deemed to be despicable or contemptible
narrow-leaved green herbage: grown as lawns; used as pasture for grazing animals; cut and dried as hay	someone who works (or provides workers) during a strike
	one who reveals confidential information to the police or other authority

grass (verb)	rat (verb)
give away information about somebody	give away information about somebody
shoot down, of birds	catch rats, especially with dogs
feed with grass	give (hair) the appearance of being fuller by using a rat
cover with grass	desert one's party or group of friends, for example, for one's personal advantage
spread out clothes on the grass to let it dry and bleach	take the place of work of someone on strike
	employ scabs or strike breakers in