deviate vs vary

deviate

verb
  • To go off course from; to change course; to change plans. 

  • To cause to diverge. 

  • To fall outside of, or part from, some norm; to stray. 

noun
  • A person with deviant behaviour; a deviant, degenerate or pervert. 

  • A value equal to the difference between a measured variable factor and a fixed or algorithmic reference value. 

vary

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

  • 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 change with time or a similar parameter. 

  • To display differences. 

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