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All answers having "Climax" as clue:

3 Character Answers:

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CAP

END



4 Character Answers:

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ACME

APEX

HEAD

PEAK



6 Character Answers:

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APOGEE

FINISH

ZENITH



8 Character Answers:

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HIGHSPOT

HIGHTIDE

SHOWDOWN



10 Character Answers:

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CRUCLPOINT