Synonyms and related words :
agent, alterant, alterative, alterer, ancestor, announcer, antecedent, architect, author, avant-garde, bellwether, buccinator, bushwhacker, catalyst, catalytic agent, creator, developer, explorer, ferment, forebear, foregoer, forerunner, front runner, frontiersman, fugleman, groundbreaker, guide, harbinger, herald, innovationist, introducer, inventor, lead runner, leader, leaven, maker, messenger, modificator, modifier, original, originator, pathfinder, pioneer, point, precedent, precursor, predecessor, producer, scout, stormy petrel, trailblazer, trailbreaker, transformer, transmogrifier, vanguard, vaunt-courier, voortrekker, yeast