Deuce-ace is a term used in card games to refer to the combination of a two and a three on a standard deck of cards. However, there are several synonyms that can replace the term deuce-ace, including "two-three," "two and three," "two-spot and three-spot," "little Duke," and "sniper." These synonyms can be useful when playing card games, as they provide alternative ways to communicate the same combination of a two and a three. It is essential to master these synonyms to avoid confusion, especially when playing fast-paced card games like poker or blackjack.