interlocutor vs middleman

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. 

middleman

noun
  • An intermediary, agent between two (or more) parties. 

  • An intermediate dealer between the manufacturer and the retailer or customer. 

  • One who rents land in large tracts, and lets it in small portions to the peasantry. 

verb
  • To act as a middleman or intermediary. 

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