shit vs tell on

shit is a noun but tell on is not a noun.

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

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

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

shit (noun)	tell on (noun)
something of little value
Obscene word for unacceptable behavior
insulting terms of address for people who are stupid or irritating or ridiculous
a coarse term for defecation
a small worthless amount
obscene terms for feces

shit (verb)	tell on (verb)
have a bowel movement	produce an effect or strain on somebody
give away information about somebody	give away information about somebody