blabber vs verbalize

blabber is a noun but verbalize is not a noun.

Word	Noun	Adjective	Verb	Adverb
blabber	Yes	No	Yes	No
verbalize	No	No	Yes	No

As verbs, verbalize is a hypernym of blabber; that is, verbalize is a word with a broader meaning than blabber:

Other hypernyms of blabber include mouth, speak, talk, utter, verbalise.

blabber (noun)	verbalize (noun)
one who reveals confidential information to the police or other authority

blabber (verb)	verbalize (verb)
speak (about unimportant matters) rapidly and incessantly	convert into a verb
	express in speech
	be verbose
	articulate; either verbally or with a cry, shout, or noise