cathartic vs disease-free

cathartic

adj
  • Purgative; inducing mental or physical catharsis. 

  • That which releases emotional tension, especially after an overwhelming experience. 

noun
  • A laxative. 

disease-free

adj
  • free of disease, not having, carrying, or suffering from any disease. 

How often have the words cathartic and disease-free occurred in a corpus of books? (source: Google Ngram Viewer )