supergiant

noun

Any of various very massive, large, and bright stars, such as Betelgeuse or Rigel, having a luminosity that is thousands of times greater than that of the sun. When a supergiant collapses into a supernova, it may result in either a neutron star or a black hole.

noun

: A very large star having a mass between 10 and 70 solar masses

noun

an extremely bright star of very large diameter and low density