The term 'PART OF A DECK' can be solved by the crossword solutions SPADE (5 letters) and CARD (4 letters). A SPADE is a type of playing CARD, usually found in a standard deck of 52 cards. It is one of the four suits, along with clubs, diamonds, and hearts. A CARD is a thin, rectangular piece of paper or plastic used for playing games, typically with a set of rules. Cards are often used in CARD games such as poker, bridge, and blackjack.