placard vs sprayhood

placard

noun
  • An extra plate on the lower part of the breastplate or backplate of armour. 

  • A kind of stomacher, often adorned with jewels, worn in the fifteenth century and later. 

  • The woodwork and frame of the door of a closet etc. 

  • A sheet of paper or cardboard with a written or printed announcement on one side for display in a public place. 

verb
  • To announce with placards. 

  • To affix a placard to. 

sprayhood

noun
  • A frame-supported canvas over the companionway (entrance) of a sailboat providing the on-deck crew partial cover from the splashes of the seas that break against the hull of the boat. 

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