star vs Beta Crucis

star and Beta Crucis both are nouns.

Word	Noun	Adjective	Verb	Adverb
star	Yes	Yes	Yes	No
Beta Crucis	Yes	No	No	No

star (noun)	Beta Crucis (noun)
the topology of a network whose components are connected to a hub	the second brightest star in the Southern Cross
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)	Beta Crucis (adjective)
indicating the most important performer or role