blabber vs babble

blabber and babble both are nouns.

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

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

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

blabber (noun)	babble (noun)
one who reveals confidential information to the police or other authority	gibberish resembling the sounds of a baby

blabber (verb)	babble (verb)
speak (about unimportant matters) rapidly and incessantly	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