tattle vs let on

tattle is a noun but let on is not a noun.

Word	Noun	Adjective	Verb	Adverb
tattle	Yes	No	Yes	No
let on	No	No	Yes	No

As verbs, let on is a hypernym of tattle; that is, let on is a word with a broader meaning than tattle:

tattle: divulge confidential information or secrets
let on: make known to the public information that was previously known only to a few people or that was meant to be kept a secret

Other hypernyms of tattle include break, bring out, disclose, discover, divulge, expose, give away, let out, reveal, uncover, unwrap.

tattle (noun)	let on (noun)
disclosing information or giving evidence about another

tattle (verb)	let on (verb)
speak (about unimportant matters) rapidly and incessantly	make known to the public information that was previously known only to a few people or that was meant to be kept a secret
divulge confidential information or secrets