business vs employment

business and employment both are nouns.

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

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

business (noun)	employment (noun)
the principal activity in your life that you do to earn money	the occupation for which you are paid
the activity of providing goods and services involving financial and commercial and industrial aspects	the act of using
the volume of commercial activity	the act of giving someone a job
incidental activity performed by an actor for dramatic effect	the state of being employed or having a job
an immediate objective
a rightful concern or responsibility
a commercial or industrial enterprise and the people who constitute it
customers collectively
business concerns collectively