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All answers having "Sweetums" as clue:

3 Character Answers:

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HON

LUV



4 Character Answers:

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DEAR

DOLL



5 Character Answers:

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DEARY

HONEY

SUGAR

TOOTS



6 Character Answers:

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DEARIE



7 Character Answers:

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POOPSIE

TOOTSIE



8 Character Answers:

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CUTIEPIE