append vs rivet

append

verb
  • To add, as an accessory to the principal thing; to annex 

  • To write more data to the end of a pre-existing file, string, or other object. 

  • To hang or attach to, as by a string, so that the thing is suspended 

noun
  • An instance of writing more data to the end of an existing file. 

rivet

verb
  • To make firm or immovable. 

  • To command the attention of. 

  • To attach or fasten parts by using rivets. 

  • To install rivets. 

noun
  • Any fixed point or certain basis. 

  • A cylindrical mechanical fastener that attaches multiple parts together by fitting through a hole and deforming the head(s) at either end. 

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