chatter vs verbalise

chatter is a noun but verbalise is not a noun.

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

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

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

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

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

chatter (noun)	verbalise (noun)
noisy talk
the high-pitched continuing noise made by animals (birds or monkeys)
the rapid series of noises made by the parts of a machine

chatter (verb)	verbalise (verb)
speak (about unimportant matters) rapidly and incessantly	convert into a verb
talk socially without exchanging too much information	express in speech
make noise as if chattering away	be verbose
cut unevenly with a chattering tool	articulate; either verbally or with a cry, shout, or noise
click repeatedly or uncontrollably