A superbillionaire is a person who has a lot of money, even more than a billionaire.
The word superbillionaire makes people think of very, very rich people who can buy almost anything they want.
Examples:
The superbillionaire owns many big houses.
I read about a superbillionaire in the news.
The superbillionaire's car is made of gold.
I wish I were a superbillionaire and could buy a rocket ship.
The superbillionaire has so much money, they could buy a whole country.
The superbillionaire's money could fill a swimming pool!