literature vs novella

literature

noun
  • Written fiction of a high standard. 

  • The body of all written works. 

  • All the papers, treatises, etc. published in academic journals on a particular subject. 

  • The collected creative writing of a nation, people, group, or culture. 

novella

noun
  • A short novel or long short story. 

  • Synonym of novel (“new legal constitution in Ancient Rome”) 

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