dictator

/ˈdɪkteɪtər/
noun
  1. A ruler who has total power over a country, often using force to control people.
    • The dictator banned all opposition newspapers.
    • History books describe the dictator as cruel and power-hungry.
    • After the revolution, the dictator was overthrown by the people.
  2. A person who tells others what to do in a bossy or controlling way.
    • She acted like a dictator at home, deciding everything for her family.
    • Don't be a dictator in group projects; let others share their opinions.
    • My boss is a dictator who never listens to anyone's ideas.