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All answers having "Flourish" as clue:

4 Character Answers:

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BOOM

DASH

ELAN

GROW

WAVE



5 Character Answers:

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BLOOM

TIGHT

WIELD



6 Character Answers:

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HIDDEN

SYDNEY

THRIVE



7 Character Answers:

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BLOSSOM

BURGEON

PROSPER



8 Character Answers:

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BRANDISH

MARZIPAN