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All answers having "Abuse" as clue:

4 Character Answers:

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HARM



5 Character Answers:

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BASTE

KNEAD



6 Character Answers:

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ILLUSE

MISUSE

REVILE



8 Character Answers:

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ILLTREAT

MALTREAT

MISTREAT

NAUTILUS



12 Character Answers:

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ILLTREATMENT