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All answers having "Surface" as clue:

3 Character Answers:

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RHO



4 Character Answers:

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AREA

COAT

PAVE

SIDE

TAUT



5 Character Answers:

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ARISE

TOAIR



6 Character Answers:

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APPEAR

BOILUP

COMEUP

EMERGE

VENEER



7 Character Answers:

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OUTWARD



8 Character Answers:

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EXTERIOR