From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
34 Moby Thesaurus words for "groundbreaker": ancestor, announcer, antecedent, avant-garde, bellwether, buccinator, bushwhacker, explorer, forebear, foregoer, forerunner, front runner, frontiersman, fugleman, guide, harbinger, herald, innovator, lead runner, leader, messenger, pathfinder, pioneer, point, precedent, precursor, predecessor, scout, stormy petrel, trailblazer, trailbreaker, vanguard, vaunt-courier, voortrekker
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