polychrome vs rainbowed

polychrome

adj
  • Using multiple colours 

  • Executed in the manner of polychromy 

noun
  • A piece of multicolored pottery. 

  • esculin (so called in allusion to its fluorescent solutions) 

verb
  • To divide (a dye etc.) into multiple colours. 

  • To paint or dye with multiple colours. 

rainbowed

adj
  • Resembling, involving, or illuminated with a rainbow; patterned with the colours of the rainbow. 

  • Made up of several races or ethnicities; rainbow. 

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