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All answers having "Sponges" as clue:

4 Character Answers:

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BUMS

SOTS



5 Character Answers:

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USERS



6 Character Answers:

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CADGES

SYCONS



7 Character Answers:

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ABSORBS

CADGERS

LEECHES

MOOCHES



8 Character Answers:

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TOSSPOTS



9 Character Answers:

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DEADBEATS

FREELOADS

PARASITES