Is star an adverb

No, the Word star is a noun, a verb, and an adjective, but not an adverb. Examples:

noun: Mindy made a wish on a star.

verb: Mindy will star in the senior play.

adjective: Mindy is our star athlete.

An adverb is a Word that modifies a verb, an adjective, or another adverb. Examples:

adverb modifying a verb: Mindy really will star in the senior play.

adverb modifying an adjective: Mindy is our only star athlete.

adverb modifying an adverb: Mindy almost always wins.