callus vs shovel

callus

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

  • 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. 

verb
  • To form such hardened tissue. 

shovel

noun
  • A hand tool with a handle, used for moving portions of material such as earth, snow, and grain from one place to another, with some forms also used for digging. Not to be confused with a spade, which is designed solely for small-scale digging and incidental tasks such as chopping of small roots. 

  • A mechanical part of an excavator with a similar function. 

  • A spade. 

verb
  • To move materials with a shovel. 

  • To move with a shoveling motion. 

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