What is the difference between a star, sun, planet and a moon?

Hint: Our solar system is made up of many heavenly bodies such as the stars, sun, planets, moons, comets, asteroids, comets, etc. There are significant differences between all the celestial bodies based on their functions, sizes, shapes, numbers, etc. which are discussed below.

Complete step-by-step solution:
A star can be defined as a celestial body that possesses its own light and energy which comes from the nuclear fusions that happen inside them. They are considered as the fundamental elements of the galaxy that twinkle and are dot sized.
Our solar system has planets namely Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. A planet can be defined as a celestial body that does not has its own energy and light and is comparatively of a larger size than the stars. All the planets revolve around the sun and reflect the light that they receive from the sun and are round shaped with a lower temperature as compared to the stars.
The sun falls in the category of stars around which all the planets keep on revolving and is the main source of heat and light for the planets.
A moon can be defined as a celestial body that revolves around other bodies, specifically the planets.

Note: The sun falls in the category of stars. There are many differences between the stars and the planets, but the main difference is that stars emit light of their own while planets don’t due to which stars can twinkle while planets can’t.