cupreous vs mahogany

cupreous

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

  • Of or of the nature of copper. 

  • Containing copper. 

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

mahogany

adj
  • Having the colour of mahogany; dark reddish-brown. 

  • Made of mahogany. 

noun
  • Any of the trees from which such wood comes. 

  • A reddish-brown color, like that of mahogany wood. 

  • mahogany 

  • A Cornish drink made from gin and treacle. 

  • The wood of any of various tropical American evergreen trees, of the genus Swietenia, mostly used to make furniture. 

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