Megastar (noun)

An extremely famous and successful celebrity or performer.

Origin:

From the greek μέγας (mega) meaning "great" and the english word "star".

Examples:

1. She was a megastar in the music industry.
2. He had become a megastar overnight after winning the competition.
3. The megastar's concert was sold out in minutes.
4. The movie starred two megastars of Hollywood.
5. He was a megastar in the sports world.