flashcard vs joker

flashcard

noun
  • 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. 

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

joker

noun
  • A playing card that features a picture of a joker (that is, a jester) and that may be used as a wild card in some card games. 

  • A funny person. 

  • An unspecified, vaguely disreputable person. 

  • A friendly unit that acts as a suspected hostile unit in a military excercise. 

  • A jester. 

  • A person who makes jokes. 

  • A clause in a contract that undermines its apparent provisions. 

  • A man. 

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