initiation vs vernissage

initiation

noun
  • The first step of transcription or of transduction. 

  • The form or ceremony by which a person is introduced into any society; mode of entrance into an organized body; especially, the rite of admission into a secret society or order. 

  • The act of initiating, or the process of being initiated or introduced 

vernissage

noun
  • A private viewing of an art exhibition before it opens to the public. 

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