災い (わざわい) Disaster, Misfortune
災難 (さいなん) Misfortune, Calamity, Disaster
災害 (さいがい) Natural Disaster, Disaster, Accident
火災 (かさい) Fire Disaster, Conflagration
震災 (しんさい) Earthquake Disaster
遭難 (そうなん) Disaster, Shipwreck, Accident, Being Stranded
惨事 (さんじ) Disaster, Tragedy, Gruesome Event