update vs upgrade

update

noun
  • A change in information, a modification of existing or known data. 

  • A version of something which is newer than other versions. 

  • A modification of something to a more recent, up-to-date version; (in software) a minor upgrade. 

  • An additional piece of information. An addition to existing information. 

  • An advisement providing more up-to-date information than currently known. 

verb
  • To bring (a person) up to date: to inform (a person) about recent developments. 

  • To bring (a thing) up to date. 

upgrade

noun
  • An improvement 

  • An upward grade or slope. 

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

adv
  • Up a slope or grade. 

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. 

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