placebo vs reparation

placebo

noun
  • The vespers sung in the office for the dead. 

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

reparation

noun
  • A payment of time, effort or money to compensate for past transgression(s). 

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