bowsprit vs headboard

bowsprit

noun
  • A spar projecting over the prow of a sailing vessel to provide the means of adding sail surface. 

headboard

noun
  • A panel, usually of metal, attached to the head of a fore-and-aft sail for additional strength. 

  • A grave marker made of wood. 

  • A vertical panel, either plain or upholstered, attached to the head of a bed. 

  • A board on the front of a train, carrying the train's name or that of the service it is on. 

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