cathartic vs enema

cathartic

noun
  • A laxative. 

adj
  • Purgative; inducing mental or physical catharsis. 

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

enema

noun
  • An injection of fluid into the large intestine by way of the rectum, usually for medical purposes. 

  • The fluid so injected. 

  • A device for administering such an injection. 

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