copper vs tawny

copper

adj
  • Having the reddish-brown colour/color of copper. 

  • Made of copper. 

verb
  • To sheathe or coat with copper. 

noun
  • The reddish-brown colour/color of copper. 

  • A police officer. 

  • A reddish-brown, malleable, ductile metallic element with high electrical and thermal conductivity, symbol Cu, and atomic number 29. 

  • Any of various lycaenid butterflies with copper-coloured upperwings, especially those of the genera Lycaena and Paralucia. 

tawny

adj
  • Of a light brown to brownish orange colour. 

verb
  • To become a light brown to brownish orange colour; to tan, to tawn. 

  • To cause (someone or something) to have a light brown to brownish orange colour; to tan, to tawn. 

noun
  • Synonym of tenné (“a rarely-used tincture of orange or bright brown”) 

  • In full tawny port: a sweet, fortified port wine which is blended and matured in wooden casks. 

  • Tawny owl. 

  • Tawny frogmouth. 

  • The common bullfinch or Eurasian bullfinch (Pyrrhula pyrrhula). 

  • A light brown to brownish orange colour. 

  • Something of a light brown or brownish orange colour (particularly if it has the word tawny in its name). 

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