handler vs interlocutor

handler

noun
  • One who handles something (especially manually) or someone. 

  • An advisor or manager to a person occupying a position or office to which the speaker believes the holder does not possess the typical qualifications and/or experience. 

  • A subroutine that handles a particular situation such as an event or exception. 

  • A controller, trainer, someone who handles a specified thing, animal or person (especially a prizefighter). 

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. 

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