What happens to a larger star?

Answer 1

The size (diameter) of a star can change over its lifetime; sometimes within hours.What really matters is the star's MASS.

The most massive stars will produce a lot of radiation, and thus use up their fuel very quickly. After that:

Stars up to about 1.4 solar masses will end up as white dwarves.

Above that, stars up to somewhere between 2 and 3 solar masses will end up as neutron stars.

Above that, stars end up as black holes.

The "mass" refers to whatever mass remains once the star uses up its fuel. For instance, a supernova explosion may remove a large part of the star's mass. Likewise, massive stars may lose a lot of mass during their lifetime, through their stellar wind.