clouded vs nacreous

clouded

adj
  • Filled with clouds. 

  • Variegated with spots. 

  • Made dim or blurry. 

  • Unclear; surrounded in mystery. 

nacreous

adj
  • Exhibiting lustrous or rainbow-like colors. 

  • Of, or resembling nacre (mother of pearl). 

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