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All answers having "Diminishes" as clue:

4 Character Answers:

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EBBS



5 Character Answers:

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BATES

FADES

WANES



6 Character Answers:

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ABATED

ABATES

ERODES

LETSUP

LOWERS

TAPERS



7 Character Answers:

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LESSENS

REDUCES



9 Character Answers:

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DECREASES