blab out vs babble

blab out is not a noun while babble is a noun.

Word	Noun	Adjective	Verb	Adverb
blab out	No	No	Yes	No
babble	Yes	No	Yes	No

As verbs, blab out and babble are synonyms defined as:

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

blab out (noun)	babble (noun)
	gibberish resembling the sounds of a baby

blab out (verb)	babble (verb)
divulge confidential information or secrets	to talk foolishly
	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