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All answers having "Vessels" as clue:

4 Character Answers:

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ARKS

TUGS

URNS



5 Character Answers:

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BOATS

CRAFT

ELUDE

SHIPS



6 Character Answers:

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BARGES

LINERS

SLOOPS



7 Character Answers:

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BUSSTOP

CARAFES

LATEENS

SAILERS

TANKERS



8 Character Answers:

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STEAMERS



11 Character Answers:

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OCEANLINERS

RECEPTACLES