copperish vs cupreous

copperish

adj
  • Like copper; coppery. 

cupreous

adj
  • Containing copper. 

  • Of a reddish-brown color, like that of polished copper. 

  • Of or of the nature of copper. 

noun
  • A reddish-brown color, like that of polished copper. 

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