nacreous vs waxen

nacreous

adj
  • Exhibiting lustrous or rainbow-like colors. 

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

waxen

adj
  • Having the pale smooth characteristics of wax, waxlike, waxy. 

  • Of or pertaining to wax. 

  • Easily effaced, as if written in wax. 

  • Grown. 

  • Made of wax; covered with wax. 

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