1. 独裁者;专政者
A dictator is a ruler who has complete power in a country, especially power which was obtained by force and is used unfairly or cruelly.
noun
1. a person who behaves in a tyrannical manner
e.g. my boss is a dictator who makes everyone work overtime
Synonym: authoritarian
2. a ruler who is unconstrained by law
Synonym: potentate
3. a speaker who dictates to a secretary or a recording machine