callus vs furrow

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. 

furrow

noun
  • A trench cut in the soil, as when plowed in order to plant a crop. 

  • Any trench, channel, or groove, as in wood or metal. 

  • A deep wrinkle in the skin of the face, especially on the forehead. 

verb
  • To cut one or more grooves in (the ground, etc.). 

  • To wrinkle. 

  • To pull one's brows or eyebrows together due to concentration, worry, etc. 

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