promoter vs showman

promoter and showman both are nouns.

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

As nouns, promoter and showman are synonyms defined as:

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

Other synonyms of promoter include impresario.

promoter (noun)	showman (noun)
someone who is an active supporter and advocate	a sponsor who books and stages public entertainments
a sponsor who books and stages public entertainments	a person skilled at making effective presentations