blab vs divulge

blab and divulge both are verbs.

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

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

blab: divulge confidential information or secrets
divulge: make known to the public information that was previously known only to a few people or that was meant to be kept a secret

Other hypernyms of blab include break, bring out, disclose, discover, expose, give away, let on, let out, reveal, uncover, unwrap.

blab (verb)	divulge (verb)
divulge confidential information or secrets	make known to the public information that was previously known only to a few people or that was meant to be kept a secret
speak (about unimportant matters) rapidly and incessantly