impresario vs promoter

impresario and promoter both are nouns.

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

As nouns, impresario and promoter are synonyms defined as:

impresario and promoter: a sponsor who books and stages public entertainments

Other synonyms of impresario include showman.

impresario (noun)	promoter (noun)
a sponsor who books and stages public entertainments	someone who is an active supporter and advocate
	a sponsor who books and stages public entertainments