patience vs severity

patience

noun
  • The quality of being patient. 

  • Any of various card games that can be played by one person. Called solitaire in the US and Canada. 

severity

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

  • The state of being severe. 

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