absolve vs lustrate

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.). 

lustrate

verb
  • To make clear or pure by means of a propitiatory offering; to purify. 

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