superstar

noun3

1. •
   Someone who has accumulated a vast amount of fame; a high-level celebrity.
2. •
   An exceptionally productive employee.

   • Want to hire a coding superstar? Call the agent. — 2014
3. •
   (rare) A giant star; (loosely) any giant star, bright giant, supergiant, or hypergiant.

   • Toward the centre of the cluster, where they were more strongly congested, the whole region glowed as though as it were a monstrous superstar. — 1975