babble vs blither

babble is a noun but blither is not a noun.

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

As verbs, babble and blither are synonyms defined as:

Other synonyms of babble include blather, blether, smatter.

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

babble (verb)	blither (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