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All answers having "Calamity" as clue:

3 Character Answers:

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ILL

POX

WOE



4 Character Answers:

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BLOW



6 Character Answers:

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CRISIS

MISHAP

PLAGUE



7 Character Answers:

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TROUBLE



8 Character Answers:

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ACCIDENT

DISASTER



9 Character Answers:

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CATACLYSM