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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Wild card, often:

DEUCES: Wild cards, often
TOFHS: Wild card, often
DEUCE: Wild card, often
JOKERS: Often-wild cards
ONEEYEDJACK: Wild card in poker, often
TWO: It's often wild; what a card!