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All answers having "Moisten" as clue:

3 Character Answers:

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WET



4 Character Answers:

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LEER

LICK

MIST



5 Character Answers:

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BASTE

BATHE

BEDEW



6 Character Answers:

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BEDAMP

DAMPEN

SPRITZ



7 Character Answers:

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HYDRATE

RESERVE



8 Character Answers:

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HUMIDIFY

IRRIGATE

SPRINKLE