Category Nuances for stock-market_crash:

• economic,
• critical,
• complex,
• unpredictable,
• single,
• financial,
• seminal,
• untoward,
• repeated,
• dramatic,
• sudden,
• catastrophic,
• historical,
• singular,
• rare,
• systemic,

Simple Categories for stock-market_crash:

• catastrophe,
• change,
• disaster,
• event,