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All answers having "Alleviate" as clue:

4 Character Answers:

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EASE



5 Character Answers:

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ABATE



6 Character Answers:

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ABSENT

DISPEL

SOFTEN

SOOTHE



7 Character Answers:

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ASSUAGE

LIGHTEN

RELIEVE



8 Character Answers:

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MITIGATE

PALLIATE