picture card vs playing card

picture card

noun
  • A playing card which has a picture on it (usually Jack, Queen or King (coat card), but sometimes including Ace or Joker). 

  • A trading card/trade card. 

  • A flash memory card for a digital camera. 

playing card

noun
  • Any of the usually 52 rectangular pieces of card used to play numerous games, featuring either one to 10 pips or a picture and belonging of one of four suits. 

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