deprecate vs enhance

deprecate

verb
  • To declare something obsolescent; to recommend against a function, technique, command, etc. that still works but has been replaced. 

  • To belittle or express disapproval of. 

enhance

verb
  • To augment or make something greater. 

  • To take up contrast agent (for an organ, tissue, or lesion). 

  • To improve something by adding features. 

  • To be raised up; to grow larger. 

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