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All answers having "Falls" as clue:

4 Character Answers:

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EBBS

IOWA

SAGS



5 Character Answers:

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DROPS

IDAHO

KEELS

PLOPS



6 Character Answers:

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SPILLS



7 Character Answers:

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AUTUMNS

CASCADE

NIAGARA

TOPPLES



8 Character Answers:

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CASCADES

DESCENDS



10 Character Answers:

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WHITEWATER