A red giant is a star in the final stages of its life time that has expanded to hundreds of times its original diameter. Because the star has expanded without gaining mass, a reg giant has an extremely low average density. A neutron star is the collapsed core of a dead massive star. It contains a mass a few times that of the sun in an area only a few miles across, making it extremely dense; only the singularity of a black hole is denser.
one is big one is small
See related questions.
A supergiant simply is a large giant - so, it is larger (in diameter) than a "regular" giant star.
one is big one is small
The difference is that the giant star has it's death more seriously but,The huge star is mostly not well important to the huge star.
A subgiant star is larger than a neutron star. Neutron stars are incredibly dense and compact remnants of massive stars, while subgiant stars are in a transitional phase between main sequence and red giant stages, typically larger and more diffuse than neutron stars.
The mass of the star.
A neutron star is the densest object known to us. (Apart from a black hole). See related question.
white dwarf if it has low mass Neutron star or Blackhole if it is massive enough to cause a red super giant
Yes, a Red Giant star is typically much larger than a neutron star. Red Giants are evolved massive stars that have expanded and cooled, while neutron stars are extremely dense remnants of supernova explosions that are only about 10-20 kilometers in diameter.
The mass could either be a red giant or a super giant, they both evolve into different ways, after a star runs out of fuel, it becomes a white dwarf, a neutron star, or a black hole.
After a death of a Giant Star, a corpse of a star will be the remaining of it, right in the center of the aftermath, you will find one of the strangest objects in the Universe, the Pulsar and the Neutron Star.