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All answers having "___ pool" as clue:

3 Character Answers:

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CAR

POT

VAN



4 Character Answers:

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CESS

GENE

LIDO

LLYN

MERE

POND

TANK

TARN



5 Character Answers:

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KITTY

MERGE

STENO

TIDAL

UNITE



6 Character Answers:

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LAGOON



9 Character Answers:

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RESERVOIR



10 Character Answers:

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CONSORTIUM

NATATORIUM



15 Character Answers:

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POCKETBILLIARDS