Category Nuances for null:

• local,
• ecological,
• level,
• physical,
• acting,
• serious,
• negative,
• anthropogenic,
• natural,
• environmental,
• interactive,
• spatial,
• excessive,
• special,
• real,
• infrequent,
• stochastic,
• gross,
• perceptual,
• driving,
• biological,
• dynamic,
• evolutionary,
• regional,
• logical,
• deterministic,
• fatal,
• tropical,
• unusual,
• biotic,
• commercial,
• cognitive,
• abnormal,
• unanticipated,
• public,
• stressful,
• temporal,
• dangerous,
• digestive,
• physiological,
• miscellaneous,
• unpredictable,
• regulated,

Simple Categories for null:

• disorder,
• case,
• process,
• event,
• activity,
• incident,
• activation,
• atmosphere,
• variation,
• perturbation,
• attribute,
• situation,
• interference,
• control,
• condition,
• use,
• training,
• thing,
• level,
• upset,
• order,
• abnormality,
• interaction,
• change,