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All answers having "Hike" as clue:

3 Character Answers:

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JUP



4 Character Answers:

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RISE

SNAP

TREK

WALK



5 Character Answers:

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BOOST

RAISE

TAKEA

TRAMP

TROOP



6 Character Answers:

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HOOFIT

JACKUP



7 Character Answers:

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ELEVATE



8 Character Answers:

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BACKPACK

LONGWALK