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All answers having "Butter up" as clue:

3 Character Answers:

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GAS

WOO



4 Character Answers:

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FTER



5 Character Answers:

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BASTE



6 Character Answers:

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SOFTEN



7 Character Answers:

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FLATTER



8 Character Answers:

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BENICETO

SOFTSOAP



10 Character Answers:

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CURRYFAVOR