Potentate
Part of speech: noun
Definition: A powerful leader; a monarch; a ruler
Dictator
Part of speech: noun
Definition: Originally, a magistrate without colleague in republican ancient Rome, who held full executive authority for a term granted by the senate (legislature), typically to conduct a warA totalitarian leader of a country, nation, or governmentA tyrannical boss, or authority figureA person who dictates text (e.g. letters to a clerk)
Example sentence: A dictator keeps control and leads. A tyrant is someone selfish who destroys.