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All answers having "Mouths" as clue:

3 Character Answers:

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ORA

RHO



4 Character Answers:

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MAWS

YAPS



5 Character Answers:

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BOCAS

TRAPS



6 Character Answers:

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BAZOOS



7 Character Answers:

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KISSERS

STOMATA



8 Character Answers:

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LIPSYNCS