interlocutor vs speaker

interlocutor

noun
  • A person who takes part in dialogue or conversation. 

  • A man in the middle of the line in a minstrel show who questions the end men and acts as leader. 

  • A decree of a court. 

  • An interlocutory judgement or sentence. 

speaker

noun
  • One who speaks. 

  • Speakerphone. 

  • The literary character uttering the lyrics of a poem or song, as opposed to the author writing the words of that character. 

  • The producer of a given utterance, whether speech or text. 

  • The chair or presiding officer of certain legislative bodies, such as the U.K. House of Commons or the U.S. House of Representatives. 

  • A book containing passages of text for use in speeches. 

  • A key on a woodwind instrument of the clarinet family (cf octave key on other instruments) which induces the instrument to overblow. 

  • One who makes a speech to an audience. 

  • Loudspeaker. 

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