One who avenges or vindicates / One who takes vengeance.

plural of avenger

(obsolete) vengeful

(obsolete) vengeance.

(rare) The inflicting of retributive punishment; satisfaction taken.

(transitive) To take vengeance (for); to exact satisfaction for by punishing the injuring party; to vindicate by inflicting pain or evil on a wrongdoer. / (intransitive, obsolete) To take vengeance.

(archaic) An act of vengeance; a revenge.

simple past tense and past participle of avenge

present participle of avenge

The act by which somebody is avenged.