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All answers having "Shh!" as clue:

3 Character Answers:

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PPP



4 Character Answers:

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HUSH



5 Character Answers:

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QUIET

WHIST

ZIPIT



7 Character Answers:

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SILENCE



8 Character Answers:

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BESILENT

DONTTALK

NOTAPEEP



9 Character Answers:

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KEEPQUIET

NOTALKING



10 Character Answers:

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ZIPYOURLIP



11 Character Answers:

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QUIETPLEASE



13 Character Answers:

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DONTTELLASOUL

JUSTBETWEENUS



14 Character Answers:

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HOLDYOURTONGUE

NOTANOTHERWORD

PUTA{SOCK}INIT



15 Character Answers:

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NOTALKINGPLEASE

OURLITTLESECRET