belfry vs skyscraper

belfry

noun
  • A part of a large tower or steeple, specifically for containing bells. 

  • A shed. 

  • A tower or steeple specifically for containing bells, especially as part of a church. 

skyscraper

noun
  • A very tall building with a large number of floors. 

  • Anything very tall or high. 

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