deprecate vs make light of

deprecate

verb
  • To belittle or express disapproval of. 

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

make light of

verb
  • To regard without due seriousness; to joke about. 

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