concern vs business

concern and business both are nouns.

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

As nouns, business is a hyponym of concern; that is, business is a word with a more specific, narrower meaning than concern:

Other hyponyms of concern include bugaboo, burden, encumbrance, incumbrance, load, onus.

As nouns, concern and business are synonyms defined as:

concern and business: a commercial or industrial enterprise and the people who constitute it

Other synonyms of concern include business concern, business organisation, business organization.

concern (noun)	business (noun)
something that interests you because it is important or affects you	the principal activity in your life that you do to earn money
something or someone that causes anxiety; a source of unhappiness	the activity of providing goods and services involving financial and commercial and industrial aspects
a feeling of sympathy for someone or something	the volume of commercial activity
an anxious feeling	incidental activity performed by an actor for dramatic effect
a commercial or industrial enterprise and the people who constitute it	an immediate objective
	a rightful concern or responsibility
	a commercial or industrial enterprise and the people who constitute it
	customers collectively
	business concerns collectively

concern (verb)	business (verb)
be relevant to
be on the mind of