Impersonator (noun)

1. A person who assumes or pretends to be another person.
2. A person who performs as a celebrity look-alike or a mimic.

Origin:

From the latin in- (not) + persona (person) + -ator (a noun suffix).

Examples:

1. The police arrested an impersonator who claimed to be a government official.
2. The impersonator of Michael Jackson was so good that he was hired to perform in Las Vegas.
3. The impersonator of Elvis Presley has been performing for over 20 years.
4. The impersonator of Barack Obama was able to fool the crowd at the rally.
5. He is a well-known impersonator in the comedy world.