condolence vs mercilessness

condolence

noun
  • An expression of comfort, support, or sympathy offered to the family and friends of somebody who has died. 

  • Comfort, support or sympathy. 

mercilessness

noun
  • The property of being merciless. 

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