editor vs librarian

editor

noun
  • A person who edits or makes changes to documents. 

  • A machine used for editing (cutting and splicing) movie film 

  • A person who edited a specific document. 

  • Someone who manipulates video footage and assembles it into the correct order etc for broadcast; a picture editor. 

  • A copy editor. 

  • A program for creating and making changes to files, especially text files. 

  • A person at a newspaper, publisher or similar institution who edits stories and/or decides which ones to publish. 

librarian

noun
  • A person who processes and organizes information. 

  • The keeper, manager of a library. 

  • One who cares for the publications, files etc. in a library, whether staff or volunteer. 

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