leniency vs selfishness

leniency

noun
  • The quality of mercy or forgiveness, especially in the assignment of punishment as in a court case. 

  • An act of being lenient. 

selfishness

noun
  • the quality of being selfish; the condition of putting one's own interests before those of others. 

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