showman vs impresario

showman and impresario both are nouns.

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

As nouns, showman and impresario are synonyms defined as:

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

Other synonyms of showman include promoter.

showman (noun)	impresario (noun)
a sponsor who books and stages public entertainments	a sponsor who books and stages public entertainments
a person skilled at making effective presentations