charcoal vs coal

charcoal

verb
  • To cook over charcoal. 

  • To draw with charcoal. 

adj
  • Made of charcoal. 

  • Of a dark gray colour. 

noun
  • impure carbon obtained by destructive distillation of wood or other organic matter, that is, heating it in the absence of oxygen. 

  • A stick of black carbon material used for drawing. 

  • A drawing made with charcoal. 

  • A very dark gray colour. 

coal

verb
  • To be converted to charcoal. 

  • To supply with coal. 

  • To take on a supply of coal (usually of steam ships). 

  • To burn to charcoal; to char. 

  • To mark or delineate with charcoal. 

noun
  • A type of coal, such as bituminous, anthracite, or lignite, and grades and varieties thereof, as a fuel commodity ready to buy and burn. 

  • A glowing or charred piece of coal, wood, or other solid fuel. 

  • A black or brownish black rock formed from prehistoric plant remains, composed largely of carbon and burned as a fuel. 

  • A piece of coal used for burning (this use is less common in American English) 

  • charcoal. 

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