Spider three decks is a term generally used for a type of solitaire card game. The game involves three decks of cards and requires the player to build up eight sets of cards from king to ace in each of the eight foundation piles. It can be a challenging and time-consuming game, which often requires concentration and strategy to win. However, if you're looking for synonyms for the term "spider three decks," you may consider using phrases like "three-deck spider solitaire," "triple-deck spider," "large spider solitaire," or "spider with three decks." Each of these descriptive phrases offers a different yet similar way of describing the popular card game.