pervert vs straighten

pervert

verb
  • To corrupt; to cause to be untrue; corrupted or otherwise impure 

  • To turn another way; to divert. 

  • to misinterpret designedly. 

  • To misapply, misuse, use for a nefarious purpose 

  • To become perverted; to take the wrong course. 

noun
  • A person whose sexual habits are not considered acceptable. 

straighten

verb
  • To bribe or corrupt. 

  • To clarify a situation or concept to (an audience). 

  • To stand up, especially from a sitting position. 

  • To cause to become straight. 

  • To become straight. 

  • To put in order; to sort; to tidy up. 

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