exhibitionist vs poseur

exhibitionist and poseur both are nouns.

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

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

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

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

exhibitionist (noun)	poseur (noun)
someone who deliberately behaves in such a way as to attract attention	a person who habitually pretends to be something he is not
someone with a compulsive desire to expose the genitals