absolve vs purify

absolve

verb
  • To grant a remission of sin; to give absolution to. 

  • To pronounce free from or give absolution for a penalty, blame, or guilt. 

  • To pronounce not guilty; to grant a pardon for. 

  • To remit a sin; to give absolution for a sin. 

  • To pass a course or test; to gain credit for a class; to qualify academically. 

  • To set free, release or discharge (from obligations, debts, responsibility etc.). 

purify

verb
  • To free from guilt or sin. 

  • To cleanse, or rid of impurities. 

  • To become pure. 

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