analgesic vs mitigatory

analgesic

adj
  • Acting to relieve pain; being an analgesic. 

  • Unable to feel pain. 

noun
  • Any medicine, such as aspirin, that reduces pain, especially without inducing a loss of other sensation. (Contrast anesthetic.) 

mitigatory

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

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