multicolor vs polychromatic

multicolor

adj
  • Having, resembling, or pertaining to many colors. 

noun
  • A display of many colors. 

polychromatic

adj
  • Showing a variety, or a change, of colours; having many colours; multicoloured. 

  • Composed of more than one wavelength. 

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