exhibitionist vs show-off

exhibitionist and show-off both are nouns.

Word	Noun	Adjective	Verb	Adverb
exhibitionist	Yes	No	No	No
show-off	Yes	No	No	No

As nouns, exhibitionist and show-off are synonyms defined as:

exhibitionist and show-off: someone who deliberately behaves in such a way as to attract attention

exhibitionist (noun)	show-off (noun)
someone who deliberately behaves in such a way as to attract attention	someone who deliberately behaves in such a way as to attract attention
someone with a compulsive desire to expose the genitals