monologuize vs monologue

monologuize is not a noun while monologue is a noun.

Word	Noun	Adjective	Verb	Adverb
monologuize	No	No	Yes	No
monologue	Yes	No	No	No

monologuize (noun)	monologue (noun)
	speech you make to yourself
	a (usually long) dramatic speech by a single actor
	a long utterance by one person (especially one that prevents others from participating in the conversation)

monologuize (verb)	monologue (verb)
talk to oneself