polychromate vs spotted

polychromate

adj
  • Composed of many colours 

noun
  • A salt or ion composed of multiple chromate groups 

spotted

adj
  • Discoloured by spots; stained. 

  • Characterized by spots (used especially of animals and plants). 

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