overhaul vs retrofit

overhaul

verb
  • To modernize, repair, renovate, or revise completely. 

  • To search (a ship) for contraband goods. 

  • To keep (running rigging) clear, and see that no hitch occurs. 

  • To pass, overtake, or travel past. 

noun
  • A major repair, renovation, or revision. 

  • The process after the fire appears extinguished in which the firefighters search the structure for signs of hot spots that may cause the structure to reignite. Often this includes the process of salvage under the blanket term, salvage and overhaul. 

retrofit

verb
  • 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 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 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 overhaul and retrofit occurred in a corpus of books? (source: Google Ngram Viewer )