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All answers having "Venomous snake" as clue:

3 Character Answers:

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ASP



5 Character Answers:

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ADDER

COBRA

KRAIT

MAMBA

TEPID

VIPER



6 Character Answers:

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TAIPAN



7 Character Answers:

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INDIANA

OCTUPLE



8 Character Answers:

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MOCCASIN

PITVIPER



9 Character Answers:

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KINGCOBRA

PUFFADDER



10 Character Answers:

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COPPERHEAD



15 Character Answers:

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WATERMOCCAPRIDE