avenger
n. countablen. someone who punishes a person for doing something wrong or harmful to others. You usually do this to get justice for a friend or family member.
n. one who inflicts punishment or retribution in response to a perceived wrong or injury. Often implies a sense of moral justification or personal duty to rectify a grievance.
He saw himself as a secret avenger for the poor.
In the classic story, the hero returns home as an avenger to punish those who stole his family's land.
The protagonist functions less as a traditional hero and more as a cold avenger, driven by a singular obsession to dismantle the criminal empire that ruined his life.
From Middle English avengere; equivalent to avenge + -er.
Often followed by the preposition 'of' to specify the victim or the crime being punished.