Modifiers matching calamity:

• sudden,
• unforeseen,
• environmental,
• financial,
• natural,
• destructive,
• world,
• international,
• marine,
• massive,
• unfortunate,
• serious,
• national,
• terrible,
• common,
• physical,
• devastating,
• widespread,
• unforeseeable,
• major,
• political,
• public,
• violent,

Simple categories matching widespread:

• disturbance,
• disease,
• practice,
• affliction,
• condition,
• hazard,
• dermatosis,
• event,
• catastrophe,
• calamity,
• problem,
• emergency,
• malady,
• scourge,
• infection,
• illness,
• therapy,
• storm,
• rock,
• situation,
• zoonosis,
• disaster,
• area,
• disorder,
• energy,
• material,
• phenomenon,
• source,
• sickness,