forestay vs hydrofoil

forestay

noun
  • A stay that extends from the top of the foremast to the bow or bowsprit of a sailing ship 

verb
  • To stay beforehand; secure or fasten with or as with a forestay. 

  • To stay, delay, postpone, or hinder beforehand; forestall; prevent. 

hydrofoil

noun
  • A wing attached to the hull of a ship that raises it out of the water when travelling at speed and thus reduces drag. 

  • A vessel equipped with such a device. 

verb
  • To operate or use or ride atop a hydrofoil wing on a hull so equipped. 

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