atone vs propitiate

atone

verb
  • To make reparation, compensation, amends or satisfaction for an offence, crime, mistake or deficiency. 

  • To absolve (someone else) of wrongdoing, especially by standing as an equivalent. 

propitiate

verb
  • To make propitious or favourable. 

  • To make propitiation. 

  • To conciliate, appease, or make peace with someone, particularly a god or spirit. 

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