dealership vs business concern

dealership and business concern both are nouns.

Word	Noun	Adjective	Verb	Adverb
dealership	Yes	No	No	No
business concern	Yes	No	No	No

As nouns, business concern is a hypernym of dealership; that is, business concern is a word with a broader meaning than dealership:

dealership: a business established or operated under an authorization to sell or distribute a company's goods or services in a particular area
business concern: a commercial or industrial enterprise and the people who constitute it

Other hypernyms of dealership include business, business organisation, business organization, concern.

dealership (noun)	business concern (noun)
a business established or operated under an authorization to sell or distribute a company's goods or services in a particular area	a commercial or industrial enterprise and the people who constitute it