clinquant vs iridescence

clinquant

noun
  • Tinsel; glitter. 

  • Dutch metal. 

adj
  • Glittery; gleaming; sparkling; dressed in, or overlaid with, tinsel finery. 

iridescence

noun
  • Any shimmer of glittering and changeable colors. 

  • The condition or state of being iridescent; exhibition of colors like those of the rainbow; a prismatic play of color. 

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