aperient vs mitigatory

aperient

adj
  • Having a gentle laxative effect. 

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. 

mitigatory

adj
  • reducing, lessening the effects of something, generally something painful or uncomfortable 

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