ivory vs mother-of-pearl

ivory

adj
  • Made of ivory. 

  • Resembling or having the colour of ivory. 

noun
  • The keys of a piano. 

  • A creamy white color, the color of ivory. 

  • The hard white form of dentin which forms the tusks of elephants, walruses and other animals. 

  • The teeth. 

  • A white person. 

  • Something made from or resembling ivory. 

  • A die (object bearing numbers, thrown in games of chance). 

mother-of-pearl

adj
  • Made from or looking like mother-of-pearl; iridescent or pearly. 

noun
  • A butterfly of the genus Salamis. 

  • The hard pearly inner layer of certain mollusk shells; nacre. 

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