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

Crossword clues for Thieves' slang:

ARGOT: Thieves' slang
SOUP: Nitroglycerin: Thieves' slang.
PETE: Safe: Thieves' slang.
PETE: Strongbox: Thieves' slang.
GONOFS: Thieves: Slang
CANT: Secret slang of thieves
CANTS: Secret thieves of slang
SPIVS: Petty thieves: Brit. slang.
GAS: The Canadian slang "hoser" originally referred to thieves who stole it