helpmate vs interlocutor

helpmate

noun
  • A person who supplies help or companionship. 

  • A recreational problem in chess in which both sides cooperate to achieve a specific goal. 

  • A wife or spouse. 

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