biography vs novelette

biography

noun
  • The art of writing this kind of story. 

  • A person's life story, especially one published. 

verb
  • To write a biography of. 

novelette

noun
  • A short novel. 

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

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