名词

1. 暴君;专制君主;暴君似的人
You can use tyrant to refer to someone who treats the people they have authority over in a cruel and unfair way.

1. a cruel and oppressive dictator

Synonym: autocratdespot

2. any person who exercises power in a cruel way

e.g. his father was a tyrant

3. in ancient Greece, a ruler who had seized power without legal right to it