organ-grinder vs showman

organ-grinder and showman both are nouns.

Word	Noun	Adjective	Verb	Adverb
organ-grinder	Yes	No	No	No
showman	Yes	No	No	No

As nouns, showman is a hypernym of organ-grinder; that is, showman is a word with a broader meaning than organ-grinder:

Other hypernyms of organ-grinder include impresario, promoter.

organ-grinder (noun)	showman (noun)
a street musician who plays a hand organ or hurdy-gurdy	a sponsor who books and stages public entertainments
	a person skilled at making effective presentations