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All answers having "Ache" as clue:

3 Character Answers:

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AIL

YEN



4 Character Answers:

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HURT

LONG

PAIN

PANG

PINE



5 Character Answers:

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CRAMP

SMART

THROB

TUMMY

YEARN



6 Character Answers:

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BESORE



8 Character Answers:

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SORENESS