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

Crossword clues for BB, for one 4 letters:

SHOT: BB, for one
BATH: One of the B's in BB&B
PELLET: One BB
PELLET: BB, for one
DROID: BB-8, for one
BED: One of the B's in BB&B