Madonna vs comfort girl

Madonna

noun

  • An artistic representation of the Virgin Mary, chiefly when holding the infant Jesus. 

  • A morally pure woman. 

name

  • The Virgin Mary, the mother of Jesus. 

  • A female given name from Italian. 

comfort girl

noun

  • A female sex slave; prostitute. 

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