exhibitioner vs promoter

exhibitioner and promoter both are nouns.

Word	Noun	Adjective	Verb	Adverb
exhibitioner	Yes	No	No	No
promoter	Yes	No	No	No

As nouns, promoter is a hypernym of exhibitioner; that is, promoter is a word with a broader meaning than exhibitioner:

Other hypernyms of exhibitioner include impresario, showman.

exhibitioner (noun)	promoter (noun)
someone who organizes an exhibit for others to see	someone who is an active supporter and advocate
	a sponsor who books and stages public entertainments