cast iron vs shuck

cast iron

noun
  • A hard and brittle, but strong, alloy of iron, carbon, and silicon, formed by casting in a mould. 

adj
  • Inflexible or without exception. 

  • Made of cast iron. 

  • Durable; tough; resilient. 

shuck

noun
  • The shell or husk, especially of grains (e.g. corn/maize) or nuts (e.g. walnuts). 

  • A fraud; a scam. 

  • A phony. 

verb
  • To remove the shuck from (walnuts, oysters, etc.). 

  • To fool; to hoax. 

  • To do hurriedly or in a restless way. 

  • To walk at a slow trot. 

  • To avoid; baffle, outwit, shirk. 

  • To remove (any outer covering). 

  • To slither or slip, move about, wriggle. 

  • To shake; shiver. 

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