blab vs babble

blab is not a noun while babble is a noun.

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

As verbs, blab and babble are synonyms defined as:

As verbs, babble is a hyponym of blab; that is, babble is a word with a more specific, narrower meaning than blab:

Other hyponyms of blab include blather, blether, blither, smatter.

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

blab (verb)	babble (verb)
divulge confidential information or secrets	to talk foolishly
speak (about unimportant matters) rapidly and incessantly	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