egress vs katabasis

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. 

katabasis

noun
  • Any journey downwards or fall. 

  • A retreat, especially a military one. 

  • A journey from the interior of a country to the coast. 

  • The presence of downward (drainage or katabatic) winds. 

  • A mytheme or trope in which the hero embarks on a journey to the underworld. 

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