fill in vs update

fill in

verb
  • To inform somebody, especially to supply someone missing or missed information. 

  • To substitute for somebody or something. 

  • To complete a form or questionnaire with requested information. 

  • To beat up; to physically assault. 

  • To fill; to replace material that is absent or has been removed. 

update

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

  • To bring (a thing) up to date. 

noun
  • 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. 

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

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

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