barque vs cockboat

barque

noun
  • A sailing vessel or boat of any kind. 

  • A sailing vessel of three or more masts, with all masts but the sternmost square-rigged, the sternmost being fore-and-aft-rigged 

cockboat

noun
  • A small rowing boat, especially one pulled behind a larger ship, or used to ferry goods between a ship and the shore. 

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