moiré vs nacreous

moiré

verb
  • To give a watered or clouded appearance to (a surface). 

noun
  • A fabric, often silk, which has a watery or wavelike appearance. 

  • A pattern that emerges when two grids are superimposed over one another, sometimes unintended or undesirable in many applications such as in weaving and screenprinting. 

nacreous

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

  • Exhibiting lustrous or rainbow-like colors. 

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