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Pathfinder (noun)
One who discovers a way or path; one who explores untraversed regions.
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Pathfinder (noun)
One who first does something; a pioneer.
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Trailblazer (noun)
One that blazes a trail to guide others; a pathfinder.
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Trailblazer (noun)
An innovative leader in a field; a pioneer.
Wiktionary