blunder out vs verbalize

blunder out and verbalize both are verbs.

Word	Noun	Adjective	Verb	Adverb
blunder out	No	No	Yes	No
verbalize	No	No	Yes	No

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

Other hypernyms of blunder out include mouth, speak, talk, utter, verbalise.

blunder out (verb)	verbalize (verb)
utter impulsively	convert into a verb
	express in speech
	be verbose
	articulate; either verbally or with a cry, shout, or noise