peace offering vs placation

peace offering

noun
  • An offering or concession made to an adversary in the hope of obtaining peace or reconciliation; an olive branch. 

  • A religious sacrifice. 

placation

noun
  • A process or act of placating; appeasement or an expression of appeasement. 

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