cockboat vs yawl

cockboat

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

yawl

noun
  • A small ship's boat, usually rowed by four or six oars. 

  • A fore-and-aft rigged sailing vessel with two masts, main and mizzen, the mizzen stepped abaft the rudder post. 

verb
  • To cry out; to howl. 

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