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All answers having "Puffed up" as clue:

4 Character Answers:

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LIED

SMUG

VAIN



5 Character Answers:

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PROUD

RISEN



6 Character Answers:

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ELATED



7 Character Answers:

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BLOATED

PLUMPED

POMPOUS

SWELLED

SWOLLEN



8 Character Answers:

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BILLOWED

INFLATED