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All answers having "Joie de vivre" as clue:

3 Character Answers:

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VIM



4 Character Answers:

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ELAN

ZEST



5 Character Answers:

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GUSTO



6 Character Answers:

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ESPRIT

GAIETY

GAYETY

SPIRIT



8 Character Answers:

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VIBRANCY



11 Character Answers:

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ZESTFORLIFE