copper vs pintail

copper

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

  • 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. 

adj
  • Made of copper. 

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

verb
  • To sheathe or coat with copper. 

pintail

noun
  • Any of various species of libellulid dragonfly of the genus Acisoma, endemic to Africa and Asia. 

  • A pintail duck, a type of dabbling duck with a characteristic pointed tail. 

  • A surfboard with a pointed back end. 

  • A pin-tailed snipe, Gallinago stenura. 

  • The end of a fastening pin or mandrel on a Huckbolt or pop rivet that is broken off when installation is complete. 

  • A northern pintail, Anas acuta, a dabbling duck of the northern hemisphere that has a long pointed tail. 

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