adapt vs vary

adapt

verb
  • To make by altering or fitting something else; to produce by change of form or character 

  • To make suitable; to make to correspond; to fit or suit 

  • To fit by alteration; to modify or remodel for a different purpose; to adjust 

  • To make oneself comfortable to a new thing. 

adj
  • Adapted; fit; suited; suitable. 

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