Sun vs star

Sun and star both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sun	Yes	No	No	No
star	Yes	Yes	Yes	No

Sun (noun)	star (noun)
the star that is the source of light and heat for the planets in the solar system	the topology of a network whose components are connected to a hub
first day of the week; observed as a day of rest and worship by most Christians	a star-shaped character * used in printing
	(astronomy) a celestial body of hot gases that radiates energy derived from thermonuclear reactions in the interior
	any celestial body visible (as a point of light) from the Earth at night
	an actor who plays a principal role
	someone who is dazzlingly skilled in any field
	a performer who receives prominent billing
	a plane figure with 5 or more points; often used as an emblem

Sun (adjective)	star (adjective)
	indicating the most important performer or role