milky vs nacreous

milky

adj
  • Of the black in an image, appearing as dark gray rather than black. 

  • Containing a whitish liquid, juicy. 

  • Containing (an especially large amount of) milk. 

  • Resembling milk in color, consistency, smell, etc.; consisting of milk. 

  • Immature, childish. 

  • Cowardly. 

nacreous

adj
  • Exhibiting lustrous or rainbow-like colors. 

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

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