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All answers having "Ooze" as clue:

3 Character Answers:

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GOO

MUD

RHO



4 Character Answers:

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EMIT

LEAK

MIRE

MUCK

SEEP

SLOP



5 Character Answers:

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EXUDE

IMPEL

SLIME



6 Character Answers:

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SLUDGE



7 Character Answers:

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NARWHAL

SEEPAGE



8 Character Answers:

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BADBLOOD