gabble vs verbalise

gabble is a noun but verbalise is not a noun.

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

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

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

gabble (noun)	verbalise (noun)
rapid and indistinct speech

gabble (verb)	verbalise (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