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All answers having "Heaps" as clue:

4 Character Answers:

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ALOT

ATON

LOTS

MANY

TONS



5 Character Answers:

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ALOAD

APILE

ASLEW

LOADS

PECKS

PILES

SCADS

SLEWS



6 Character Answers:

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ALOTOF

CRATES

MASSES

MOUNDS

OODLES

STACKS



7 Character Answers:

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ANDORRA

DISTURB

PASSELS