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All answers having "Make better" as clue:

3 Character Answers:

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AGE



4 Character Answers:

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CURE

HEAL

MEND

THUS



5 Character Answers:

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AMEND

EMEND



6 Character Answers:

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ENRICH

LIMPID

REFORM

SOOTHE



7 Character Answers:

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ENHANCE

IMPROVE



9 Character Answers:

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ALLEVIATE



10 Character Answers:

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AMELIORATE