palace vs plafond

palace

noun
  • A large, ornate public building used for entertainment or exhibitions. 

  • A large and lavishly ornate residence. 

  • Official residence of a head of state or other dignitary, especially in a monarchical or imperial governmental system. 

plafond

noun
  • A ceiling, especially one that is ornately decorated. 

  • The tibial plafond. 

  • A painting or decoration on a ceiling. 

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