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All answers having "Plunders" as clue:

3 Character Answers:

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RHO



4 Character Answers:

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ROBS



5 Character Answers:

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LOOTS

PREYS

RAIDS

SACKS



6 Character Answers:

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RAVENS

REAVES

RIFLES

STRIPS



7 Character Answers:

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MARAUDS

RAPINES

RAVAGES



8 Character Answers:

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DESPOILS

RANSACKS