aperient vs catharsis

aperient

noun
  • A laxative, either in the form of a medicine or a food such as asparagus or hops, which has the effect of moving the bowels, or aiding digestion and preventing constipation. 

adj
  • Having a gentle laxative effect. 

catharsis

noun
  • Purging of the digestive system. 

  • A release of emotional tension after an overwhelming vicarious experience, resulting in the purging or purification of the emotions, as through watching a dramatic production (especially a tragedy). 

  • A purification or cleansing, especially emotional. 

  • A therapeutic technique to relieve tension by re-establishing the association of an emotion with the memory or idea of the event that first caused it, and then eliminating it by complete expression (called the abreaction). 

  • Any release of emotional tension to the same effect, more widely. 

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