ivory vs sperm whale

ivory

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

  • The keys of a piano. 

  • A creamy white color, the color of ivory. 

  • The teeth. 

  • A white person. 

  • Something made from or resembling ivory. 

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

adj
  • Resembling or having the colour of ivory. 

  • Made of ivory. 

sperm whale

noun
  • A whale (Physeter catodon, syn. Physeter macrocephalus), the largest of the toothed whales. 

  • Any whale in the superfamily Physeteroidea, which also includes the small whales of genus Kogia. 

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