The largest stars - that is, largest in diameter - are usually red. This is related to the fact that their surface temperature is relatively low. They still radiate huge amounts of energy though, due to their large surface.
The giant star
Red giant is a type of star.
A giant star is a giant dense ball of gas that is near its last stages of a star.
A red giant star.
A giant star is smaller than the sun.
Dubhe is not a red giant but rather a subgiant star. It is the brightest star in the Big Dipper asterism and is classified as an evolved F-type subgiant star.
one is big one is small
Hypergiant.
If you mean a giant star, no.
A supergiant simply is a large giant - so, it is larger (in diameter) than a "regular" giant star.
That would mainly depend on the star's mass.
A giant star is a dying star that expanded, and the core shrinks are the same time. When the shell of the giant star drift into space as planetary nebula, the core became a white dwarf. The white dwarf is made from the core of the giant star.