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

Crossword clues for Slave drivers:

TYRANTS: Slave drivers
CRACKINGTHEWHIP: Acting like a slave driver
TASKMASTER: Slave driver
TYRANT: Slave driver's cousin.
TYRANT: Slave-driver
FASTER: Slave driver's exhortation