mercifulness vs revel

mercifulness

noun
  • The state of being merciful; mercy. 

revel

verb
  • To make merry; to have a happy, lively time. 

  • To take delight (in something). 

noun
  • A kind of dance. 

  • An instance of merrymaking; a celebration. 

  • A wake for the dead. 

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