foreyard vs topsail

foreyard

noun
  • A yard on the lower mast of a square-rigged foremast of a ship used to support the foresail. 

  • A yard in front; front yard 

topsail

noun
  • In a fore-and-aft-rigged sailing boat, the sail that is set above the gaff at the top part of the mast. 

  • A sail or either of the two sails rigged just above the course sail and supported by the topmast on a square-rigged sailing ship. 

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