Nouns

(n)leadership, leading2the activity of leading“his leadership inspired the team”
(n)lead1, leading1thin strip of metal used to separate lines of type in printing

Adjectives

(s)leading, prima, star, starring, stellarindicating the most important performer or role“the leading man”, “prima ballerina”, “prima donna”, “a star figure skater”, “the starring role”, “a stellar role”, “a stellar performance”
(s)leading, preeminentgreatest in importance or degree or significance or achievement“the country's leading poet”, “a preeminent archeologist”
(a)leadinggoing or proceeding or going in advance; showing the way“we rode in the leading car”, “the leading edge of technology”
(s)ahead, in the lead, leadinghaving the leading position or higher score in a contest“he is ahead by a pawn”, “the leading team in the pennant race”