callus vs squiggle

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. 

squiggle

noun
  • An illegible scrawl. 

  • A short twisting or wiggling line or mark. 

  • Synonym of tilde. 

verb
  • To write illegibly. 

  • To make a squiggle. 

  • To wriggle or squirm. 

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