fill in vs include

fill in

verb
  • 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. 

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

include

verb
  • To consider as part of something; to comprehend. 

  • To use a directive that allows the use of source code from another file. 

  • To bring into a group, class, set, or total as a (new) part or member. 

noun
  • A piece of source code or other content that is dynamically retrieved for inclusion in another item. 

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