harbor vs harborage

harbor

noun
  • Any place of shelter. 

  • A sheltered expanse of water, adjacent to land, in which ships may anchor or dock, especially for loading and unloading. 

  • A mixing box for materials. 

  • A harbor, even if it is a little harbor, is a good thing, since adventurers come into it as well as go out, and the life in it grows strong, because it takes something from the world, and has something to give in return - Sarah Orne Jewett 

verb
  • To take refuge or shelter in a protected expanse of water. 

  • To drive (a hunted stag) to covert. 

  • To hold or persistently entertain in one's thoughts or mind. 

  • To provide a harbor or safe place for. 

harborage

noun
  • A place of shelter or entertainment. 

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

  • A place for refuge for a vessel. 

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