babble vs blather

babble and blather both are nouns.

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

As verbs, babble and blather are synonyms defined as:

Other synonyms of babble include blether, blither, smatter.

babble (noun)	blather (noun)
gibberish resembling the sounds of a baby	foolish gibberish

babble (verb)	blather (verb)
to talk foolishly	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