THESAURUS
Harbinger
Gabriel, ancestor, announce, announcer, antecedent, augury, avant-garde, bellwether, buccinator, buccinator novi temporis, bushwhacker, evangel, evangelist, explorer, forebear, foregoer, forerun, forerunner, foreshadower, foreshow, foretoken, front runner, frontiersman, fugleman, give notice, groundbreaker, guide, herald, herald angel, innovator, lead runner, leader, messenger, notify, omen, outrider, pathfinder, pioneer, point, portent, preannounce, precedent, precursor, predecessor, preindicate, premonitor, presage, presager, proclaim, run before, scout, sign, stormy petrel, trailblazer, trailbreaker, vanguard, vaunt-courier, voortrekker
ROGET THESAURUS
Harbinger
Precursor
N
precursor, antecedent, precedent, predecessor, forerunner, vancourier, avant-coureur, pioneer, prodrome, prodromos, prodromus, outrider, leader, bellwether, herald, harbinger, foreboding, dawn, avant-courier, avant-garde, bellmare, forelooper, foreloper, stalking-horse, voorlooper, voortrekker, prelude, preamble, preface, prologue, foreword, avant-propos, protasis, proemium, prolusion, proem, prolepsis, prolegomena, prefix, introduction, heading, frontispiece, groundwork, preparation, overture, exordium, symphony, premises, prefigurement, omen, precursory, prelusive, prelusory, preludious, proemial, introductory, prefatory, prodromous, inaugural, preliminary, precedent, a precedent embalms a principle.
Omen
N
omen, portent, presage, prognostic, augury, auspice, sign, harbinger, yule candle, bird of ill omen, signs of the times, gathering clouds, warning, prefigurement, ill-boding, auspicium melioris aevi.