dialog vs duologue

dialog

noun
  • A conversation or other form of discourse between two or more individuals. 

  • A literary form, where the presentation resembles a conversation. 

  • In a dramatic or literary presentation, the verbal parts of the script or text; the verbalizations of the actors or characters. 

  • A dialog box. 

verb
  • To discuss or negotiate so that all parties can reach an understanding. 

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 dialog and duologue occurred in a corpus of books? (source: Google Ngram Viewer )