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All answers having "Greedy" as clue:

4 Character Answers:

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AVID



5 Character Answers:

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AVIDE

PIGGY



7 Character Answers:

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HOGGISH

PORCINE

SELFISH



8 Character Answers:

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COVETOUS

EDACIOUS

ESURIENT

RAVENOUS



9 Character Answers:

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RAPACIOUS



10 Character Answers:

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AVARICIOUS



11 Character Answers:

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MONEYHUNGRY