callus vs smart

callus

verb
  • To form such hardened tissue. 

noun
  • A shining area on the frons of many species of Tabanomorpha (horse flies and relatives). 

  • The material of repair in fractures of bone; a substance exuded at the site of fracture, which is at first soft or cartilaginous in consistency, but is ultimately converted into true bone and unites the fragments into a single piece. 

  • The new formation over the end of a cutting, before it puts out rootlets. 

  • A hardened area of the skin (especially on the foot or hand) caused by repeated friction, wear or use. 

smart

verb
  • To hurt or sting. 

  • To cause a smart or sting in. 

  • To feel a pungent pain of mind; to feel sharp pain or grief; be punished severely; to feel the sting of evil. 

adj
  • Equipped with intelligent behaviour (digital/computer technology). 

  • Good-looking; well dressed; fine; fashionable. 

  • Cleverly shrewd and humorous in a way that may be rude and disrespectful. 

  • Sharp; keen; poignant. 

  • Exhibiting intellectual knowledge, such as that found in books. 

  • Sudden and intense. 

  • Exhibiting social ability or cleverness. 

  • Causing sharp pain; stinging. 

noun
  • Smart-money. 

  • Mental pain or suffering; grief; affliction. 

  • A sharp, quick, lively pain; a sting. 

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