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The employee is hired to do work by the employer.
Commissions are when one hires someone else to do something. In this case, the artist is getting paid for drawing a sketch for that person.
The person is a blackmailer.
A knowledgeable person.
A person?
a person
You call that person a scholar.
No, it's a verb. Definition: To engage the services of (a person) for a fee; employ: hires a new clerk.
You would call them someone who peruses.
an ally
You can call someone who does not lie honest, truthful, trustworthy, or sincere.
someone who works for a business