overhaul vs upgrade

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. 

upgrade

verb
  • To improve, usually applied to technology, generally by complete replacement of one or more components 

  • To replace with something better. 

  • To improve the equipment or furnishings of or services rendered to 

  • To replace a program with a later version of itself, a version having a higher version number or marketed under a more recent product name. 

  • To improve in condition or status. 

adv
  • Up a slope or grade. 

noun
  • An upward grade or slope. 

  • An improvement 

  • An improved component or replacement item, usually applied to technology 

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