ashen vs nacreous

ashen

adj
  • Ash-colored; pale; anemic, anaemic; appalled. 

  • Of or resembling ashes. 

  • Made from the wood of the ash-tree. 

verb
  • To turn into ash; make or become ashy 

  • To make or become pale 

nacreous

adj
  • Exhibiting lustrous or rainbow-like colors. 

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

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