enchantress vs femme fatale

enchantress

noun
  • A beautiful, charming and irresistible woman. 

  • A femme fatale. 

  • A woman, especially an attractive one, skilled at using magic; an alluring witch. 

femme fatale

noun
  • An attractive and seductive but ultimately dangerous woman. 

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