analgesic vs palliative

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.) 

palliative

adj
  • Serving to palliate; serving to extenuate or mitigate. 

  • Minimising the progression of a disease and relieving undesirable symptoms for as long as possible, rather than attempting to cure the (usually incurable) disease. 

noun
  • Something that palliates, particularly a palliative medicine. 

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