saga vs short story

saga

noun
  • Something with the qualities of such a saga; an epic, a long story. 

  • An Old Norse (Icelandic) prose narrative, especially one dealing with family or social histories and legends. 

short story

noun
  • A work of fiction that is shorter than a novella. 

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