Modifiers matching occurrence:

• unforeseen,
• natural,
• violent,
• common,
• musical,
• unique,
• discrete,
• acoustic,
• unforeseeable,
• climatic,
• unusual,
• dangerous,
• exceptional,
• unexpected,
• physical,
• terrifying,
• unfortunate,
• astronomical,
• catastrophic,
• weather,
• commonplace,
• unavoidable,
• unpredictable,
• planned,
• medical,
• outdoor,
• meaningful,
• specified,
• local,
• abnormal,
• cosmic,
• sudden,
• miscellaneous,
• adverse,
• normal,
• hazardous,
• criminal,
• inanimate,
• cataclysmic,
• positive,
• undesirable,
• geographical,
• unanticipated,
• untoward,
• neurologic,
• strange,
• accidental,
• happy,
• elemental,
• odd,
• infrequent,
• extreme,
• localised,
• serious,
• internal,
• transient,
• seasonal,
• significant,
• major,
• spontaneous,
• rare,
• outside,
• neurological,
• severe,
• seismic,
• social,
• supernatural,
• external,
• harmful,
• unplanned,
• deviant,
• awesome,
• possible,
• historical,
• costly,
• damaging,
• special,
• routine,
• ordinary,
• extraordinary,
• stressful,
• unwanted,
• operational,
• annual,
• corporeal,
• random,
• benign,
• simple,
• irregular,
• relevant,
• environmental,
• interactive,
• small,
• unlikely,
• organizational,
• disruptive,
• exogenous,
• tragic,
• future,
• traumatic,
• devastating,
• political,
• autonomic,
• interesting,
• deadly,
• temporary,
• uncertain,
• unpleasant,
• geologic,
• negative,
• dynamic,
• motivational,
• dramatic,
• periodic,
• disastrous,
• recent,
• single,
• everyday,
• superficial,

Simple categories matching possible:

• career,
• cause,
• infection,
• substance,
• problem,
• equipment,
• bacteria,
• situation,
• condition,
• activity,
• contaminant,
• theme,
• intermediate,
• hazard,
• virus,
• antigen,
• complication,
• layer,
• form,
• place,
• motion,
• sport,
• acid,
• usage,
• precursor,
• rodent,
• artifact,
• event,
• change,
• disease,
• material,
• illness,
• defect,
• solution,
• disorder,
• germ,
• syndrome,
• opposition,
• parasite,
• area,
• evidence,
• accident,
• thing,
• symptom,
• state,
• pathology,
• indication,
• impurity,
• interaction,
• service,
• difficulty,
• toxin,
• target,
• failure,
• request,
• protease,
• substrate,
• feature,
• danger,
• chemical,
• means,
• agent,
• conflict,
• information,
• incident,
• comfort,
• modification,
• pollutant,
• transformation,
• catalyst,
• specification,
• development,
• use,
• mechanism,
• reaction,
• animal,
• sector,
• sentence,
• predator,
• volatile,
• ingredient,
• work,
• group,
• contamination,
• list,
• way,
• catastrophe,
• emotion,
• abrasive,
• disaster,
• toxicant,
• market,
• entity,
• surface,
• injury,
• action,
• precipitant,
• system,
• process,
• piece,
• residue,
• eruption,
• lesion,
• pathogen,
• prey,
• fuel,
• malady,
• metal,
• procedure,
• poison,
• nexus,
• allergen,
• organism,
• inflammation,
• morbidity,
• error,
• disturbance,
• fluid,
• entertainment,
• occurrence,
• extra,
• facility,
• assistant,