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All answers having "Brutes" as clue:

4 Character Answers:

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APES



5 Character Answers:

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OGRES



6 Character Answers:

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BEASTS

TOUGHS



7 Character Answers:

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ANIMALS

CAVEMEN

SADISTS

SAVAGES

UNICORN



8 Character Answers:

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RUFFIANS



11 Character Answers:

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TROGLODYTES