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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.
例句
Since 1804 the country has mostly been ruled by tyrants.
自 1804 年以来，该国大部分时间都处于暴君的统治之下。
...households where the father was a tyrant.
父亲残暴专横的家庭