talk vs blab out

talk is a noun but blab out is not a noun.

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

As verbs, talk and blab out are synonyms defined as:

talk (noun)	blab out (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')

talk (verb)	blab out (verb)
express in speech	divulge confidential information or secrets
exchange thoughts; talk with
reveal information
use language
deliver a lecture or talk
divulge confidential information or secrets