callus vs ditch

callus

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

  • 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. 

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

verb
  • To form such hardened tissue. 

ditch

noun
  • A trench; a long, shallow indentation, as for irrigation or drainage. 

  • A raised bank of earth and the hedgerow on top. 

verb
  • To dig ditches around. 

  • To dig ditches. 

  • To throw into a ditch. 

  • To discard or abandon. 

  • To deliberately not attend classes; to play hookey. 

  • To deliberately crash-land an airplane on water. 

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