WordNet sense 1 (an actor who plays a principal role):

lead, principal, lead, lead

WordNet sense 2 (a performer who receives prominent billing):

headliner

WordNet sense 3 (someone who is dazzlingly skilled in any field):

ace, adept, champion, genius, hotshot, maven, sensation, superstar, virtuoso, whiz, whizz, wiz, wizard, mavin, adept

WordNet sense 4 (a star-shaped character * used in printing):

asterisk

WordNet sense 5 (the topology of a network whose components are connected to a hub):

star topology

WordNet sense 6 (indicating the most important performer or role):

leading, stellar, prima, starring

WordNet sense 7 (of greater importance or stature or rank):

major