novelette vs paperback

novelette

noun
  • A short novel. 

  • A short piece of lyrical music, especially one for the piano. 

paperback

noun
  • A book with flexible binding. 

verb
  • To issue or publish (a book) in a paperback edition. 

adj
  • Having flexible binding. 

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