footfall vs footrest

footfall

noun
  • The sound made by a footstep; also, the footstep or step itself. 

  • The number of pedestrians going into or passing through a place (especially a commercial venue such as a shop) during a specified time period; also, the pedestrians in a particular place regarded collectively; foot traffic. 

footrest

noun
  • A support on which to rest the feet. 

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