copper vs red-brown

copper

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

• Made of copper. 

• To sheathe or coat with copper. 

• 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. 

red-brown

• Having a colour between red and brown. 

• Having the qualities of fascism and communism.