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All answers having "Boob" as clue:

3 Character Answers:

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ASS

OAF

TIT



4 Character Answers:

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DITZ

DODO

LOUT

SIMP

TATA

TUBE

TWIT



5 Character Answers:

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ERROR

GAFFE

IDIOT

NINNY

SCHMO

TWERP



6 Character Answers:

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NITWIT



9 Character Answers:

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BLUNDERER