oppressor; tyrant
Refers to a person or entity that exercises oppressive power, often in political or social contexts.
The oppressor of that country deprived the people of their freedom.
Many tyrants appear in history.
暴君 is a more literary term for a tyrannical ruler, often with a connotation of cruelty.
Compound of 圧制 (oppression) + 者 (person). The exact historical derivation is uncertain, but the word is transparently formed from its components.