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All answers having "Foster" as clue:

4 Character Answers:

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ABET

REAR



5 Character Answers:

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ADOPT

BREED

EZOLA

NURSE

SAPID



6 Character Answers:

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AROUSE

DRUMUP

ENABLE

FOMENT



7 Character Answers:

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CHERISH

INSTILL

NOURISH

NURTURE

PROMOTE



8 Character Answers:

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ENGENDER



9 Character Answers:

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ENCOURAGE