STing vs nerd

STing

noun
  • Storytelling in the context of a tabletop role-playing game, especially one published by White Wolf. 

nerd

noun
  • A member of a subculture revolving around intellectualism, video games, fantasy and science fiction, comic books and assorted media. 

  • One who has an intense, obsessive interest in something. 

  • A person who is intellectual but generally introverted. 

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