Many people died in that disaster.
The accident escalated into a major tragedy.
A terrible disaster occurred at the factory.
His carelessness led to a disaster.
Quick action prevented a disaster.
A small mistake turned into a major disaster.
事故 is a neutral word for any accident, whereas 惨事 implies a severe, often deadly result.
悲劇 emphasizes the emotional, tragic drama of an event, while 惨事 is more of a news-report term for a disastrous incident.
惨劇 usually refers to a bloody, violent tragedy like a murder, while 惨事 covers any tragic accident or disaster including natural ones.
参事 (a councillor or advisor) is pronounced identically to 惨事 but has a completely unrelated meaning, so context is essential.
惨事 names the tragic incident or accident itself, while 惨状 describes the devastated scene or aftermath that results from it.
惨事 as an incident is typically counted with 件, the counter for matters or cases.
great disaster; catastrophe; train wreck
Compound of 惨 (miserable, tragic) and 事 (event, matter). The exact historical derivation is uncertain, but the spelling is conventionally associated with its meaning.