avenge / revenge
People avenge something or avenge themselves on somebody: She vowed to avenge her brother's death. • He later avenged himself on his wife's killers.
People revenge themselves on somebody or are revenged on them: He was later revenged on his wife's killers. You cannot revenge something: You can not say :She vowed to revenge her brother's death-
I hope this helps,
Student or Learner