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All answers having "Hole" as clue:

3 Character Answers:

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GAP

PIT

PLT

STY



4 Character Answers:

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CARD

LAIR

PERF

PORE

SINK

SLOT



5 Character Answers:

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HIDEY

INONE

OZONE



6 Character Answers:

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CAVITY

CRATER

DEFECT

GAPING



7 Character Answers:

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ORIFICE



8 Character Answers:

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APERTURE