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All answers having "Horses" as clue:

4 Character Answers:

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BAYS

NAGS



5 Character Answers:

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ARABS

FOALS

MARES

POWER

ROANS



6 Character Answers:

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LOPERS

MOUNTS

PACERS

STEEDS



7 Character Answers:

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EQUINES



8 Character Answers:

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NEIGHERS

PRANCERS



9 Character Answers:

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STALLIONS



11 Character Answers:

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EQUILATERAL