chance

[1]	happen , gamble , occur , come to pass , take place , take chances , come about , adventure , run a risk , befall , betide , take a chance
[2]	find , risk , hazard , imperil , bump , encounter , endanger , jeopardize , stake , bet , wager

[1]	fortune , luck , fate
[2]	opportunity , time , turn , hazard , occasion
[3]	chances , likelihood , probability , prospect , odds , certainty , predictability , conceivability , possibility
[4]	chances , risk , speculation , gamble
[5]	by chance , accidentally , unintentionally , inadvertently , perhaps , maybe , possibly , conceivably

adj.

[1]	casual , incidental , accidental , unintentional , inadvertent , unplanned , unpremeditated , unexpected , unforeseen , unlooked-for