verbalize vs speak

verbalize and speak both are verbs.

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

As verbs, verbalize and speak are synonyms defined as:

Other synonyms of verbalize include mouth, talk, utter, verbalise.

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

Other hypernyms of verbalize include mouth, talk, utter, verbalise, verbalize.

verbalize (verb)	speak (verb)
convert into a verb	express in speech
express in speech	exchange thoughts; talk with
be verbose	use language
articulate; either verbally or with a cry, shout, or noise	give a speech to
	make a characteristic or natural sound