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

Crossword clues for Gambler's boast 5 letters:

IMHOT: Gambler's boast
TINHORNS: Boastful gamblers: Slang.
IMONAROLL: Lucky gambler's boast
IMONAROLL: Hot gambler's boast