noun
oppressor; tyrant
Refers to a person or entity that exercises oppressive power, often in political or social contexts.
その国の圧制者は国民の自由を奪った。
The oppressor of that country deprived the people of their freedom.
歴史には多くの圧制者が登場する。
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.