THESAURUS
portent
adumbration, advance notice, augury, auspice, balefulness, banefulness, betokening, betokenment, bodefulness, boding, direness, doomfulness, fatality, fatefulness, foreboding, foreshadow, foreshadowing, foreshowing, foretoken, foretokening, forewarning, indicant, indication, marvel, meaning, miracle, omen, ominousness, phenomenon, plenty of notice, portentousness, precautioning, prefiguration, preindication, premonition, premonitory shiver, premonitory sign, premonitory symptom, prenotice, prenotification, presage, presagefulness, presentiment, presignifying, prewarning, prodigy, prognostic, prognostication, promise, sensation, shadow, sign, significance, sinisterness, soothsay, stunner, suggestiveness, token, tokening, type
ROGET THESAURUS
portent
Prodigy
N
prodigy, phenomenon, wonder, wonderment, marvel, miracle, monster, curiosity, lion, sight, spectacle, jeu de theatre, coup de theatre, gazingstock, sign, St. Elmo's fire, St. Elmo's light,
portent, bursting of a shell, bursting of a bomb, volcanic eruption, peal of thunder, thunder-clap, thunder-bolt, what no words can paint, wonders of the world, annus mirabilis, dignus vindice nodus, natura il fece e poi roppe la stampa.
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.