An esthetician is a person that acts something like a dermatologist.
A person who acts without thinking is usually called "impulsive."
this person is called a mime.
That's hypocrisy, or being a hypocrite: "a person who acts in contradiction to his or her stated beliefs or feelings"
A person who acts may be called an actor or an actress. A person who acts on behalf of another is an agent.
If it is a rich person who donates money, it is called a philanthropist.
A person who acts on the stage is called an actor or actress, depending on their gender. They perform scripted or improvised roles in plays, films, or other forms of entertainment.
A person who wants to be and acts like something they are not. Wanna be's are known to be annoying, trying to fit into something they cannot.
The people that perform the dangerous acts in films are called stunt men or women.
A person who acts as a reserve to a leading actor is called an understudy. They are typically prepared to step in and play the role if the leading actor is unable to perform.
If it is a male, it is called an actor, and (if female) an actress.
Depends on the contest, could be an umpire or referee
A play without words is called a ballet, or pantomime. A person who acts without words, is called a mime.