monologist vs monologue

monologist and monologue both are nouns.

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

monologist (noun)	monologue (noun)
an entertainer who performs alone	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)