What is the difference between stars of the same spectral class, but belonging to different groups?

All stars can be divided into four groups:
1 supergiants.
2. Giants.
3. Main sequence.
4 white dwarfs
The most important difference between the same spectral class of stars can be:
1.Luminosity.
2.   size.
3. Body mass.
4. Density of the body.
At the moment, according to the spectral classification of stars, it is considered Harvard. This includes the following indicators of stars: the temperature of the star, the color of the luminary, mass compared to the Sun, radius compared to our star, solar luminosities and along the hydrogen line.