blab vs talk

blab is not a noun while talk is a noun.

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

As verbs, blab and talk are synonyms defined as:

As verbs, talk is a hypernym of blab; that is, talk is a word with a broader meaning than blab:

Other hypernyms of blab include mouth, speak, utter, verbalise, verbalize.

blab (noun)	talk (noun)
	the act of giving a talk to an audience
	an exchange of ideas via conversation
	idle gossip or rumor
	a speech that is open to the public
	discussion; (`talk about' is a less formal alternative for `discussion of')

blab (verb)	talk (verb)
divulge confidential information or secrets	express in speech
speak (about unimportant matters) rapidly and incessantly	exchange thoughts; talk with
	reveal information
	use language
	deliver a lecture or talk
	divulge confidential information or secrets