chiffon vs diaphanous

chiffon

noun
  • A lightweight, balanced plain-woven sheer fabric, or gauze, like gossamer, woven of alternate S- and Z-twist crepe (high-twist) yarns made of silk, polyester, or cotton. 

  • Any purely ornamental accessory on a woman's dress, such as a bunch of ribbon, lace, etc. 

diaphanous

adj
  • Transparent or translucent; allowing light to pass through; capable of being seen through. 

  • Isorefractive, having an identical refractive index. 

  • Of a fine, almost transparent, texture; gossamer; light and insubstantial. 

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