palaver vs blab

palaver is a noun but blab is not a noun.

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

As verbs, palaver and blab are synonyms defined as:

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

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

palaver (noun)	blab (noun)
loud and confused and empty talk
flattery intended to persuade

palaver (verb)	blab (verb)
have a lengthy discussion, usually between people of different backgrounds	divulge confidential information or secrets
influence or urge by gentle urging, caressing, or flattering	speak (about unimportant matters) rapidly and incessantly
speak (about unimportant matters) rapidly and incessantly