bleach vs callus

bleach

noun
  • A disease of the skin. 

  • A variety of bleach. 

  • A chemical, such as sodium hypochlorite or hydrogen peroxide, or a preparation of such a chemical, used for disinfecting or whitening. 

  • An act of bleaching; exposure to the sun. 

verb
  • To be whitened or lightened (by the sun, for example). 

  • To lose color due to stress-induced expulsion of symbiotic unicellular algae. 

  • To treat with bleach, especially so as to whiten (fabric, paper, etc.) or lighten (hair). 

  • To make meaningless; to divest of meaning; to make empty. 

callus

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

  • 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. 

verb
  • To form such hardened tissue. 

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