mistake vs reform

mistake

verb
  • To understand wrongly, taking one thing or person for another. 

noun
  • An error; a blunder. 

  • A pitch which was intended to be pitched in a hard-to-hit location, but instead ends up in an easy-to-hit place. 

reform

verb
  • To return to a good state; to amend or correct one's own character or habits 

  • To put into a new and improved form or condition; to restore to a former good state, or bring from bad to good; to change from worse to better 

  • To form again or in a new configuration. 

  • to reform a profligate man; to reform corrupt manners or morals; to reform a criminal 

noun
  • The change of something that is defective, broken, inefficient or otherwise negative, in order to correct or improve it 

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