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A person who sees an opportunity and takes advantage of it is called an opportunist. entrepreneur
IT.
A Catholic.
A guardian takes care of his/her ward.
The ceremony after a person takes office is called an "inauguration."
That is called a bookie or bookmaker.
Sonographer
Sonographer
A person who takes up a certain space is typically referred to as an occupant.
A person who takes pictures with a camera is called the camera man.
They are called a Menagerie Man.
It is called gambling.