iridescent vs rainbowed

iridescent

adj
  • Producing a display of lustrous, rainbow-like colors; prismatic. 

  • Brilliant, lustrous, or colorful. 

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 iridescent and rainbowed occurred in a corpus of books? (source: Google Ngram Viewer )