rat vs snitch

rat and snitch both are nouns.

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

As nouns, snitch is a hyponym of rat; that is, snitch is a word with a more specific, narrower meaning than rat:

rat: one who reveals confidential information to the police or other authority
snitch: someone acting as an informer or decoy for the police

As verbs, rat and snitch are synonyms defined as:

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

rat (noun)	snitch (noun)
any of various long-tailed rodents similar to but larger than a mouse	someone acting as an informer or decoy for the police
a pad (usually made of hair) worn as part of a woman's coiffure
a person who is deemed to be despicable or contemptible
someone who works (or provides workers) during a strike
one who reveals confidential information to the police or other authority

rat (verb)	snitch (verb)
give away information about somebody	give away information about somebody
catch rats, especially with dogs	take by theft
give (hair) the appearance of being fuller by using a rat
desert one's party or group of friends, for example, for one's personal advantage
take the place of work of someone on strike
employ scabs or strike breakers in