three-decker vs work of fiction

three-decker

noun
  • An old-fashioned pulpit. 

  • Anything with three layers or levels. 

  • A sailing warship that had guns on each of three decks. 

work of fiction

noun
  • A fictional account; a story. 

  • A fictitious account; an account of events that never took place. 

How often have the words three-decker and work of fiction occurred in a corpus of books? (source: Google Ngram Viewer )