Modifiers matching occurrence:

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

Simple categories matching exogenous:

• pathogen,
• substance,
• phenomenon,
• food,
• agent,
• cytokine,
• development,
• substrate,
• chemical,
• buffer,
• protease,
• compound,
• antioxidant,
• toxin,
• event,
• asthma,
• signal,
• amphetamine,
• catecholamine,
• condition,
• cause,
• hexose,
• sterol,
• drug,
• glucocorticoid,
• solute,
• process,
• retrovirus,
• dna,
• demand,
• antigen,
• stimulant,
• carbohydrate,
• molecule,
• material,
• enzyme,
• precursor,
• shock,
• issue,
• control,
• force,
• toxicant,
• stimulus,
• system,
• estrogen,
• acid,
• input,
• proteinase,
• component,
• base,
• particle,
• contaminant,
• protein,
• ligand,
• acceptor,
• activator,
• variable,
• polysaccharide,
• alteration,
• authority,
• hormone,
• change,
• opsonin,
• disturbance,
• inhibitor,
• source,
• phosphoprotein,
• occurrence,
• factor,
• opiate,
• steroid,
• metal,
• corticosteroid,
• macromolecule,
• poison,
• sugar,
• intoxicant,
• carcinogen,
• cofactor,
• inducer,
• amine,