mot vs side chick

mot

noun
  • A prostitute. 

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

  • A woman; a wife. 

  • A landlady. 

side chick

noun
  • A mistress; a woman one dates in addition to one's girlfriend or wife, usually in secret. 

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