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All answers having "Spunk" as clue:

3 Character Answers:

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GOO

PEP



4 Character Answers:

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ELAN

GRIT

GUTS

SASS



5 Character Answers:

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DRIVE

GUSTO

MOXIE

NERVE

PLUCK

SPINE



6 Character Answers:

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METTLE

SPIRIT



9 Character Answers:

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SASSINESS



10 Character Answers:

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GETUPANDGO

PLUCKINESS