molehead vs moorage

molehead

noun
  • A stone bulwark forming a haven or harbour; a breakwater. 

moorage

noun
  • A place where a ship or an aircraft may be moored. 

  • The act of mooring. 

  • The fee for mooring. 

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