gabble vs blab

gabble is a noun but blab is not a noun.

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

As verbs, gabble and blab are synonyms defined as:

gabble and blab: speak (about unimportant matters) rapidly and incessantly

Other synonyms of gabble include blabber, chatter, clack, gibber, maunder, palaver, piffle, prate, prattle, tattle, tittle-tattle, twaddle.

gabble (noun)	blab (noun)
rapid and indistinct speech

gabble (verb)	blab (verb)
speak (about unimportant matters) rapidly and incessantly	divulge confidential information or secrets
	speak (about unimportant matters) rapidly and incessantly