palliation vs vindication

palliation

noun
  • Extenuation; mitigation. 

  • The alleviation of a disease's symptoms without a cure; temporary relief. 

vindication

noun
  • The act of vindicating or the state of being vindicated. 

  • Evidence, facts, statements, or arguments that justify a claim or belief. 

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