consultation vs duologue

consultation

noun
  • A conference for the exchange of information and advice. 

  • An appointment or meeting with a professional person, such as a doctor. 

  • The act of consulting. 

duologue

noun
  • A conversation between two persons; dialogue. 

  • A dramatic performance or piece in the form of a dialogue limited to two speakers. 

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