absolution vs palliation

absolution

noun
  • The form of words by which a penitent is absolved. 

  • An absolving, or setting free from guilt, sin, or penalty; forgiveness of an offense. 

  • An absolving of sins from ecclesiastical penalties by an authority. 

  • The forgiveness of sins, in a general sense. 

palliation

noun
  • Extenuation; mitigation. 

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

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