balcony vs catwalk

balcony

noun
  • An accessible structure extending from a building, especially outside a window. 

  • An accessible structure overlooking a stage or the like. 

catwalk

noun
  • An elevated enclosed passage providing access fore and aft from the bridge of a merchant vessel. 

  • A narrow elevated stage on which models parade; a runway 

  • Any similar elevated walkway. 

  • The business of making clothes for fashion shows. 

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