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

Crossword clues for Shell occupants:

CLAM: Shell occupant
CREW: Racing shell occupants.
OARS: Shell occupants.
CREW: Shell occupants
CLAM: Half-shell occupant
OARSMEN: Shell occupants
OARSMAN: Shell occupant
ROWER: Shell occupant