christening vs purification

christening

noun
  • Any instance of someone's or something's being christened. 

  • The Christian sacrament at which someone, usually a child, is baptized and given a Christian name. 

purification

noun
  • A religious act or rite in which a defiled person is made clean or free from sin. 

  • The act or process of purifying; the removal of impurities. 

  • The pouring of wine into the chalice to rinse it after communion, the wine being then drunk by the priest. 

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