acerbation vs mortification

acerbation

noun
  • Bitterness of feeling. 

  • Exacerbation, aggravation, deterioration. 

mortification

noun
  • A sensation of extreme shame or embarrassment. 

  • A bequest to a charitable institution. 

  • The death of part of the body. 

  • The act of mortifying. 

  • A bringing under of the passions and appetites by a severe or strict manner of living. 

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