harborage vs katabasis

harborage

noun
  • A place for refuge for a vessel. 

  • A condition on land favorable to infestation by animals considered pests. 

  • A place of shelter or entertainment. 

katabasis

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

  • A retreat, especially a military one. 

  • Any journey downwards or fall. 

  • 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 harborage and katabasis occurred in a corpus of books? (source: Google Ngram Viewer )