preserve vs rework

preserve

verb
  • To maintain throughout; to keep intact. 

  • To save from decay by the use of some preservative substance, such as sugar or salt; to season and prepare (fruits, meat, etc.) for storage. 

  • To protect; to keep from harm or injury. 

noun
  • An activity with restricted access. 

  • A sweet spread made of any of a variety of fruits. 

  • A reservation, a nature preserve. 

rework

verb
  • To redo, correct, or rebuild. 

noun
  • Taking unsaleable food and using it in the manufacture of other food. 

  • Work done to correct defects associated with a deliverable product, plus any root cause analysis effort to identify the task(s) to be re-performed. 

  • An instance of reworking. 

  • The act of redoing, correcting, or rebuilding. 

  • Something redone, corrected or rebuilt. 

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