contract killing vs restitution

contract killing

noun
  • The act of hiring or procuring a contract killer. 

restitution

noun
  • The act of making good or compensating for loss or injury. 

  • A process of compensation for losses. 

  • The movement of rotation which usually occurs in childbirth after the head has been delivered, and which causes the latter to point towards the side to which it was directed at the beginning of labour. 

  • That which is offered or given in return for what has been lost, injured, or destroyed; compensation. 

  • A return or restoration to a previous condition or position. 

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