- 事故【じこ】 - accident, incident, trouble, circumstances, reasons 
- 故郷【こきょう】 - hometown, birthplace, native place, one's old home 
- 故郷【ふるさと】 - hometown, birthplace, native place, one's old home, ruins, historic remains 
- 故障【こしょう】 - fault, trouble, breakdown, failure, being out of order, damage (to a part of the body), injury, hurt, problem, hitch, obstacle, hindrance, objection, protest 
- 交通事故【こうつうじこ】 - traffic accident 
- 故意【こい】 - intent, intention, bad faith, mens rea (guilty mind) 
- 何故【なぜ】 - why, how 
- 故事【こじ】 - historical event, ancient event, tradition, folklore, legend, origin 
- 故に【ゆえに】 - therefore, consequently 
- 故人【こじん】 - the deceased, the departed, old friend, longtime acquaintance 
- 故国【ここく】 - one's native land 
- 縁故【えんこ】 - relation, connection, affinity 
- 無事故【むじこ】 - without accident 
- 人身事故【じんしんじこ】 - accident resulting in personal injury or death (esp. traffic, rail, etc.) 
- 物故【ぶっこ】 - death (of a person)