memory card vs picture card

memory card

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

  • A personal computer's expansion memory module that fits in a standard interface such as a PCI or ISA slot. 

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 memory card and picture card occurred in a corpus of books? (source: Google Ngram Viewer )