falter vs verbalise

falter is a noun but verbalise is not a noun.

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

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

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

falter (noun)	verbalise (noun)
the act of pausing uncertainly

falter (verb)	verbalise (verb)
speak haltingly	convert into a verb
walk unsteadily, tripping repeatedly	express in speech
move hesitatingly, as if about to give way	be verbose
be unsure or weak	articulate; either verbally or with a cry, shout, or noise