boardwalk vs catwalk

boardwalk

noun
  • A slightly elevated path for pedestrians over sandy or swampy ground, typically made out of wood; specifically (Canada, US) one running alongside a body of water or beach. 

verb
  • To install a boardwalk over. 

catwalk

noun
  • Any similar elevated walkway. 

  • 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 

  • The business of making clothes for fashion shows. 

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