boss, captain, caput, chairman, chairperson, chief controller, chieftain, commandant, commander, directing head, director, dux, employer, foreman, foreperson, general, head, headman, headperson, highest ranking person, leader, manager, organizer, overlooker, overseer, person in authority, person in charge, president, primate, princeps, principal, principal person, senior, superior, supervising director
associated concepts: chief agent, chief counsel, chief deputy, chief examiner, chief executive, chief executive officer, chief fiscal officer, chief judge, chief justice, chief of fire department, chief of police, chief officer of a corporation or business, chief place of business
best, cardinal (basic), cardinal (outstanding), central (essential), critical (crucial), director, dominant, employer, essential (required), grave (important), important (significant), leading (ranking first), major, master, necessary (required), outstanding (prominent), paramount, prevailing (having superior force), prevalent, primary, prime (most valuable), principal, principal (director), salient, sovereign (absolute), stellar, superintendent, superior (higher), superlative, vital
Burton's Legal Thesaurus. William C. Burton. 2006
adj.Most important; highest ranking.n.Leader or head.
The Essential Law Dictionary. — Sphinx Publishing, An imprint of Sourcebooks, Inc. Amy Hackney Blackwell. 2008.