Four of a kind is a term used in poker to describe a set of four cards of the same rank. This hand is considered one of the strongest in the game and is often difficult to beat. However, there are several other terms used to describe this hand. One such term is quads, which is short for "quadruplets" and is commonly used in the United States. Another synonym is four-of-a-kind, which is often used in Europe as well as in online poker communities. Other terms that may be used for this hand include four-up, four-at-a-time, four-spot, and four-card stud. Regardless of the term used, this hand is always a force to be reckoned with in any game of poker.