dictator

noun3

1. •
   An authoritarian leader of a country, nation, or government.

   • Dictator, noun : someone who doesn't let American CEOs dictate how their country is run — 2019
2. •
   A tyrannical boss or authority figure.
3. •
   A magistrate without colleague in republican Ancient Rome, who held full executive authority for a term granted by the Senate, typically to conduct a war.