oppressor
Definitions
A person or group that treats others in an unfair, cruel, or burdensome way.
One who exercises power or authority in a harsh, unjust, or tyrannical manner.
Examples
The citizens rose up to overthrow their cruel oppressor.
History often remembers the oppressor as the villain of the story.
Synonyms
tyrant dictator persecutor despot taskmaster autocrat tormentor
Antonyms
liberator protector savior emancipator benefactor supporter ally