See hazard in Webster's New World Roget's A-Z Thesaurus II
An unexpected random event:
accident, chance, fluke, fortuity, hap, happenchance, happenstance. See certain, surpriseThe quality shared by random, unintended, or unpredictable events or this quality regarded as the cause of such events:
chance, fortuitousness, fortuity, fortune, hap, luck. See certainExposure to possible harm, loss, or injury:
danger, endangerment, imperilment, jeopardy, peril, risk. See safetyA possibility of danger or harm:
chance, gamble, risk. See safetyLearn more about hazard