laxative vs painkiller

laxative

noun
  • Any substance, such as a food or in the form of a medicine which has a laxative effect. 

adj
  • Having the effect of moving the bowels, or aiding digestion and preventing constipation. 

painkiller

noun
  • A drug that numbs the pain in the body. 

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