airport vs catwalk

airport

noun
  • An airfield (an area designated for the takeoff and landing of aircraft), including one or more runways and (for commercial airports) one or more passenger terminals. 

catwalk

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

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

  • Any similar elevated walkway. 

  • The business of making clothes for fashion shows. 

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