The term 'Poker Prepayments' refers to the practice of placing money into the pot before a hand is dealt. This is known as an ante, which is a five-letter word that is one of the solutions to the crossword. Antes are used in poker to create an incentive for players to stay in the game and to ensure that there is always money in the pot. They also help to speed up the game by eliminating the need for players to make additional bets after the cards have been dealt.