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All answers having "High spot" as clue:

3 Character Answers:

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ALP

SKY



4 Character Answers:

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ACME

APEX

PEAK



5 Character Answers:

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AERIE

TOWER



6 Character Answers:

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APOGEE



7 Character Answers:

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EVEREST



8 Character Answers:

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MOUNTAIN

OPIUMDEN