reform vs retrofit

reform

verb
  • 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 

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

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

retrofit

verb
  • To give new characteristics or make alterations (to someone or something) to suit them to changed circumstances. 

  • To supply (a device, structure, etc.) with new components or parts that were not previously available or installed; to modernize. 

  • Synonym of backport (“to retroactively supply a fix or feature to a previous version of a software product at the same time or after supplying it to the current version.”) 

  • To supply a device, structure, etc., with new components or parts that were not previously available or installed. 

  • To add or substitute (new components or parts) that were not previously available for or installed in a device, structure, etc. 

noun
  • An act of supplying a device, structure, etc., with new components or parts that were not previously available or installed; a retrofitting. 

  • A change made to a device, structure, etc., by introducing components or parts that were not previously available or installed. 

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