curative vs placebo

curative

noun
  • A substance that acts as a cure. 

adj
  • Possessing the ability to cure, to heal or treat illness. 

  • Remediative. 

  • of a verb, conveying the meaning "the agent makes a patient do something" 

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 curative and placebo occurred in a corpus of books? (source: Google Ngram Viewer )