cordon bleu vs cordon-bleu

cordon bleu

noun
  • An award given to such chefs. 

  • Thin slices of veal, ham and cheese breaded and sautéed; somewhat like a wiener schnitzel, or Viennese cutlet. 

  • A skillful chef. 

cordon-bleu

noun
  • One of two species of passerine birds in the genus Uraeginthus. 

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