salt mine vs business

salt mine and business both are nouns.

Word	Noun	Adjective	Verb	Adverb
salt mine	Yes	No	No	No
business	Yes	No	No	No

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

Other hypernyms of salt mine include job, line, line of work, occupation.

salt mine (noun)	business (noun)
a job involving drudgery and confinement	the principal activity in your life that you do to earn money
a mine where salt is dug	the activity of providing goods and services involving financial and commercial and industrial aspects
	the volume of commercial activity
	incidental activity performed by an actor for dramatic effect
	an immediate objective
	a rightful concern or responsibility
	a commercial or industrial enterprise and the people who constitute it
	customers collectively
	business concerns collectively