Synonyms and related words :
admonishment, admonition, alarm, breakers ahead, cardhouse, cause for alarm, caution, caveat, commination, crisis, danger, dangerous ground, deterrent example, emergency, endangerment, example, final notice, final warning, foreboding, forewarning, gaping chasm, gathering clouds, hazard, hint, house of cards, imperilment, intimation, intimidation, jeopardy, lesson, menace, monition, moral, notice, notification, object lesson, omen, pass, peril, pinch, plight, portent, predicament, presage, quicksand, risk, rocks ahead, storm clouds, strait, thin ice, tip-off, ultimatum, verbum sapienti, warning, warning piece