exhibitionist vs poser

exhibitionist and poser both are nouns.

Word	Noun	Adjective	Verb	Adverb
exhibitionist	Yes	No	No	No
poser	Yes	No	No	No

As nouns, poser is a hyponym of exhibitionist; that is, poser is a word with a more specific, narrower meaning than exhibitionist:

exhibitionist: someone who deliberately behaves in such a way as to attract attention
poser: a person who habitually pretends to be something he is not

Other hyponyms of exhibitionist include grandstander, hot dog, hotdog, poseur.

exhibitionist (noun)	poser (noun)
someone who deliberately behaves in such a way as to attract attention	a particularly difficult or baffling question or problem
someone with a compulsive desire to expose the genitals	a person who poses for a photographer or painter or sculptor
	a person who habitually pretends to be something he is not