assistant vs interlocutor

assistant

noun
  • A person who assists or helps someone else. 

  • A software tool that provides assistance in some task, a wizard program. 

  • Sales assistant. 

adj
  • Helping; lending aid or support; auxiliary. 

  • Having a subordinate or auxiliary position. 

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 assistant and interlocutor occurred in a corpus of books? (source: Google Ngram Viewer )