avenge vs retaliate

avenge

verb
  • To revenge oneself (on or upon someone). 

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

retaliate

verb
  • To do something harmful or negative to get revenge for some harm; to fight back or respond in kind to an injury or affront. 

  • To repay or requite by an act of the same kind. 

How often have the words avenge and retaliate occurred in a corpus of books? (source: Google Ngram Viewer )