deactivate vs vary

deactivate

verb
  • to make something inactive or no longer effective 

  • to remove a person or piece of hardware from active military service 

  • to prevent the action of a biochemical agent (such as an enzyme) 

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 deactivate and vary occurred in a corpus of books? (source: Google Ngram Viewer )