contrast vs vary

contrast

verb
  • To form a contrast. 

  • To set in opposition in order to show the difference or differences between. 

noun
  • Something that is opposite of or strikingly different from something else. 

  • A control on a television, etc, that adjusts the amount of contrast in the images being displayed. 

  • Antithesis. 

  • is a substance used to increase the contrast of structures or fluids within the body in medical imaging. 

  • The degree of this difference. 

  • A difference between two objects, people or concepts. 

vary

verb
  • To display differences. 

  • 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. 

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