avenger
Concise Oxford English Dictionary © 2008 Oxford University Press:
avenge/əˈvenʤ/
▶verb inflict harm in return for (an injury or wrong).
■ inflict retribution on behalf of (a wronged person).
– derivatives
avenger noun.
avenger noun.
– origin ME: from OFr. avengier, from a- (from L. ad ‘to’) + vengier, from L. vindicare ‘vindicate’.
'avenger' also found in these Oxford entries:

