e-reader vs first reader

e-reader

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

first reader

noun
  • A book for children who are learning to read, usually consisting of pictures and some basic words or phrases. 

  • Synonym of publisher's reader (see reader). 

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