mot vs viscountess

mot

noun
  • A woman; a wife. 

  • A witty remark; a witticism; a bon mot. 

  • A prostitute. 

  • A landlady. 

viscountess

noun
  • The wife of a viscount. 

  • A woman holding the rank of viscount in her own right. 

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