egress vs stairway

egress

noun
  • An exit or way out. 

  • The process of exiting or leaving. 

  • The end of the transit of a celestial body through the disk of an apparently larger one. 

verb
  • To exit or leave; to go or come out. 

stairway

noun
  • A set of steps, with or without a case, that allow one to walk up or down. 

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