codex vs e-reader

codex

noun
  • A book bound in the modern manner, by joining pages, as opposed to a rolled scroll. 

  • An official list of medicines and medicinal ingredients. 

  • An early manuscript book. 

e-reader

noun
  • A hardware device used to read e-books. 

How often have the words codex and e-reader occurred in a corpus of books? (source: Google Ngram Viewer )