footwalk vs prom

footwalk

noun
  • A pedestrian walkway. 

prom

noun
  • A promenade. 

  • A formal ball held at a high school or college on special occasions; e.g,. near the end of the academic year. 

  • A promenade concert. 

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