The Oxford Thesaurus An A-Z Dictionary of Synonyms - leadern.

1) chief, head, commander, ruler, superior, director, chairman, chairwoman, chairlady, chairperson, chieftain, captain, commandant, principal, Colloq boss, bossman, kingpin, big cheese, number one, numero uno, Brit gaffer, Chiefly US Mr Big, Slang US the man: The police can identify the leader of the gang. The leader of the assembly is elected for a year. 2) bandmaster, band leader, director, US and Canadian conductor, bandleader, concert-master: The leader tapped his baton for silence.