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All answers having "Oddball" as clue:

3 Character Answers:

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NUT



4 Character Answers:

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COOT

GEEK

KOOK

ONER



5 Character Answers:

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FLAKE

QUEER

WACKO



6 Character Answers:

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CRANKY

MISFIT

WEIRDO

WEIRDY



7 Character Answers:

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ANOMALY



9 Character Answers:

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ECCENTRIC

WHIMSICAL