business vs clientele

business and clientele both are nouns.

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

As nouns, business and clientele are synonyms defined as:

Other synonyms of business include patronage.

business (noun)	clientele (noun)
the principal activity in your life that you do to earn money	customers collectively
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