alleviation vs placebo

alleviation

noun
  • the act of reducing pain or anything else unpleasant; easement 

  • the act of alleviating; relief or mitigation. 

placebo

noun
  • A dummy medicine containing no active ingredients; an inert treatment. 

  • The vespers sung in the office for the dead. 

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