moorage vs roadstead

moorage

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

  • The act of mooring. 

  • The fee for mooring. 

roadstead

noun
  • A partly sheltered anchorage; a stretch of water near the shore where vessels may ride at anchor, but with less protection than a harbour. 

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