babble vs let the cat out of the bag

babble is a noun but let the cat out of the bag is not a noun.

Word	Noun	Adjective	Verb	Adverb
babble	Yes	No	Yes	No
let the cat out of the bag	No	No	Yes	No

As verbs, babble and let the cat out of the bag are synonyms defined as:

babble and let the cat out of the bag: divulge confidential information or secrets

Other synonyms of babble include babble out, blab, blab out, peach, sing, spill the beans, talk, tattle.

babble (noun)	let the cat out of the bag (noun)
gibberish resembling the sounds of a baby

babble (verb)	let the cat out of the bag (verb)
to talk foolishly	divulge confidential information or secrets
divulge confidential information or secrets
utter meaningless sounds, like a baby, or utter in an incoherent way
flow in an irregular current with a bubbling noise