discourse vs speaker

discourse

noun
  • Expression in words, either speech or writing. 

  • A formal lengthy exposition of some subject, either spoken or written. 

  • An institutionalized way of thinking, a social boundary defining what can be said about a specific topic (after Michel Foucault). 

  • Any rational expression, reason. 

verb
  • To exercise reason; to employ the mind in judging and inferring; to reason. 

  • To engage in discussion or conversation; to converse. 

  • To write or speak formally and at length. 

speaker

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

  • Speakerphone. 

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

  • 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. 

  • One who speaks. 

  • Loudspeaker. 

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