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All answers having "Relieve" as clue:

3 Character Answers:

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AID

RID



4 Character Answers:

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EASE



5 Character Answers:

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ALLAY

HANOI

SALVE

SLAKE

SPELL

SPLAY



6 Character Answers:

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HERESY

SOOTHE



7 Character Answers:

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ASSUAGE

GOINFOR

LIGHTEN



8 Character Answers:

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DISABUSE

REASSURE

UNBURDEN



9 Character Answers:

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ALLEVIATE