blab vs verbalise

blab and verbalise both are verbs.

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

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

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

blab (verb)	verbalise (verb)
divulge confidential information or secrets	convert into a verb
speak (about unimportant matters) rapidly and incessantly	express in speech
	be verbose
	articulate; either verbally or with a cry, shout, or noise