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

Crossword clues for Packing a wallop 6 letters:

POTENT: Packing a wallop
SPIKED: Like punches that pack a wallop
ONETWOPUNCH: Combo that packs a wallop
TNT: Letters that pack a wallop
POLISHVODKA: Does it pack a wallop in Warsaw?