pilon vs plafond

pilon

noun
  • A conical loaf of sugar. 

  • A gratuity given by tradesmen to customers settling their accounts. 

  • A heap of tobacco arranged for fermentation. 

plafond

noun
  • The tibial plafond. 

  • A painting or decoration on a ceiling. 

  • A ceiling, especially one that is ornately decorated. 

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