leniency vs severity

leniency

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

  • An act of being lenient. 

severity

noun
  • The degree of something undesirable; badness or seriousness. 

  • The state of being severe. 

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