star vs starry

star is a noun but starry is not a noun.

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

star (noun)	starry (noun)
the topology of a network whose components are connected to a hub
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

star (adjective)	starry (adjective)
indicating the most important performer or role	abounding with or resembling stars