flashcard vs picture card

flashcard

noun
  • A solid-state digital memory storage format, commonly found on computers, digital cameras and cellphones. 

  • A card used to aid rote memorization. One side of the card contains data of one kind, or a question, and the other side contains the associated response which one wants to memorize. For example, one side could contain an English word, and the other side the Spanish translation. 

picture card

noun
  • A flash memory card for a digital camera. 

  • 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. 

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