callus vs ripple

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. 

ripple

noun
  • An implement, with teeth like those of a comb, for removing the seeds and seed vessels from flax, broom corn, etc. 

  • A style of ice cream in which flavors have been coarsely blended together. 

  • A small oscillation of an otherwise steady signal. 

  • A sound similar to that of undulating water. 

  • A moving disturbance, or undulation, in the surface of a fluid. 

verb
  • To shape into a series of ripples. 

  • To launch or unleash in rapid succession. 

  • To scratch, tear, or break slightly; graze 

  • To propagate like a moving wave. 

  • To move like the undulating surface of a body of water; to undulate. 

  • To remove the seeds from (the stalks of flax, etc.), by means of a ripple. 

  • To make a sound as of water running gently over a rough bottom, or the breaking of ripples on the shore. 

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