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One who performs alone is a soloist.
Invitee
A recipient.
When the emloyee performs and the employer has the ability
That person is called a Czar.
The ASVAB is a battery of tests given by the armed forces to assess several different skillsets. It can determine which military occupational specialties (MOS) a person is eligible for.
Is a government position given to a person as a reward for his or her service to a political party called a patronage job? *it is called the SPOILS system*
A person without melanin is called an albino.
An Afrikaans speaking person is often called an Afrikaner.
A person who has been canonised is called a saint.
sometimes called a "bird dog" fee.
You could call such a person a liar; you might also say that such a person is given to hyperbole.