The Clue Red : Heart :: Black : ___
The Answer SPADE
The clue "Red : Heart :: Black : ___" uses a pattern where colors are matched with symbols. In a standard deck of playing cards, the red suit is hearts, while the black suit is spades. Both hearts and spades represent one of the four suits in cards. Therefore, the answer "spade" fits perfectly as it completes the analogy with the color black.