Reverse Dictionary: PRINCIPAL

ADJECTIVES
► CAPTAIN chief, principal, leading → 1566 obs.
► HEADLY chief, principal → 971 obs.
► MASTER chief, principal; great, best; remarkable → 1750 Eng. dial.
► PALMARIAN that bears or is worthy to bear the palm; holding the first or highest place; of supreme or first-rate importance; most important, pre-eminent, principal, chief → 1815
► PALMARY that bears or is worthy to bear the palm; holding the first or highest place; of supreme or first-rate importance; most important, pre-eminent, principal, chief → 1657
► TOPPING very high or superior in position, rank, degree, amount, or estimation; chief, principal; pre-eminent, distinguished → c1685

NOUNS – PERSON
► ELDERLY MAN a chief, principal man → 1900 Eng. dial. obs. (Bk.)
► HEAD a person to whom others are subordinate; a chief, a captain, a commander, a ruler, a leader, a principal person → c897
► HEAD-BUMMER the head of a house; the chief representative of a family; the principal person → 1864 Sc.
► TANG O’ THE TRUMP, THE the most important person in any company, enterprise, or organization; the life and soul of a party, a movement, etc; the active partner in a firm; the principal person in any popular outburst. → 1887 Sc. 
► TONGUE OF THE TRUMP the most important person or thing; the principal person in any undertaking; the leader; that which is essential to the success of anything → 1820 Sc.