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All answers having "Spooky" as clue:

4 Character Answers:

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EERY



5 Character Answers:

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EERIE

EMBER

WEIRD



6 Character Answers:

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CREEPY



7 Character Answers:

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HAUNTED



8 Character Answers:

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ELDRITCH

SCIMITAR

SINISTER

SPECTRAL



13 Character Answers:

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SPINECHILLING

SPINETINGLING