folder vs rivet

folder

noun
  • A machine or person that folds things. 

  • An organizer that papers are kept in, usually with an index tab, to be stored as a single unit in a filing cabinet. 

  • A folding knife, typically a pocketknife. 

  • A virtual container in a computer's file system, in which files and other folders may be stored. The files and subfolders in a folder are usually related. 

rivet

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

  • Any fixed point or certain basis. 

verb
  • To command the attention of. 

  • To attach or fasten parts by using rivets. 

  • To make firm or immovable. 

  • To install rivets. 

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