Synonyms and related words :
accidentality, actuarial calculation, adventitiousness, break, casualness, chance, destiny, fate, flukiness, fortuitousness, fortuity, fortune, gamble, good fortune, good luck, hap, happenstance, happy chance, heedless hap, how they fall, indeterminacy, indeterminateness, lot, luck, moira, opportunity, principle of indeterminacy, probability, problematicness, random sample, risk, run of luck, serendipity, statistical probability, the breaks, theory of probability, uncertainty, uncertainty principle, whatever comes