copperhead vs rust

copperhead

noun
  • Someone with ginger hair. 

  • Coelognathus radiatus (syn. Elaphe radiata), the copperhead rat snake, a non-venomous colubrid species found in southern Asia. 

  • Agkistrodon contortrix, a venomous pit viper species found in parts of North America. 

  • Deinagkistrodon acutus, the Chinese copperhead, a venomous pit viper species found in Southeast Asia 

  • Austrelaps spp. (Australian copperheads), a genus of venomous elapids found in southern Australia and Tasmania. 

rust

noun
  • A reddish-brown color. 

  • A similar substance based on another metal (usually with qualification, such as "copper rust"). 

  • A disease of plants caused by a reddish-brown fungus. 

  • Damage caused to stamps and album pages by a fungal infection. 

  • The deteriorated state of iron or steel as a result of moisture and oxidation. 

verb
  • To (cause to) degenerate in idleness; to make or become dull or impaired by inaction. 

  • To oxidize, especially of iron or steel. 

  • To cause to oxidize. 

  • To be affected with the parasitic fungus called rust. 

  • Of a black cat or its fur, to turn rust-coloured following long periods of exposure to sunlight. 

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