placard vs wall socket

placard

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

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

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

  • 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. 

wall socket

noun
  • Any outlet or recess in a wall. 

  • A mains electricity power point mounted in or on a wall inside a dwelling or other building. 

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