equalize vs vary

equalize

verb
  • To clear the ears to balance the pressure in the middle ear with the outside pressure by letting air enter along the Eustachian tubes. 

  • To adjust the balance between frequency components within an electronic signal. 

  • To make equal; to cause to correspond in amount or degree. 

  • To make the scoreline equal by scoring points. 

  • Said of a morphism: to pre-compose with each of a parallel pair of morphisms so as to yield the same composite morphism. 

vary

verb
  • To make of different kinds; to make different from one another; to diversity; to variegate. 

  • To embellish; to change fancifully; to present under new aspects, as of form, key, measure, etc. See variation. 

  • To be or act different from the usual. 

  • Not to remain constant: to change with time or a similar parameter. 

  • To institute a change in, from a current state; to modify. 

  • To change with time or a similar parameter. 

  • To display differences. 

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