enema vs purgative

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. 

purgative

noun
  • something, such as a substance or medicine, that purges; laxative 

adj
  • purging 

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