Category Nuances for null:

• internal,
• biological,
• cellular,
• united,
• nervous,
• mechanical,
• challenging,
• historical,
• expensive,
• big,
• vital,
• seasonal,
• virtual,
• necessary,
• demographic,
• molecular,
• fundamental,
• systemic,
• diverse,
• significant,
• active,
• geographical,
• cosmic,
• important,
• social,
• natural,
• developmental,
• extreme,
• malignant,
• critical,
• dynamic,
• functional,
• stressful,
• international,
• broad,
• transient,
• biologic,
• essential,
• economic,
• smaller,
• changing,
• prolonged,
• american,
• autonomous,
• regulated,
• heavy,
• real,
• proinflammatory,
• physiological,
• complex,
• deliberate,
• structural,
• recent,
• normal,
• pathological,
• simple,
• contractile,
• societal,
• phenotypic,
• weather,
• global,
• geologic,
• planned,
• behavioral,
• demanding,
• illegal,
• infrequent,
• annual,
• relevant,
• gross,
• cultural,
• spatial,
• historic,
• ecological,
• periodic,
• animal,
• basic,
• external,
• predictable,
• evolutionary,
• stereotyped,
• technical,
• morphological,
• reproductive,
• intracellular,
• costly,
• interpersonal,
• independent,
• several,
• environmental,
• socioeconomic,

Simple Categories for null:

• event,
• occurrence,
• distribution,
• progression,
• activity,
• change,
• choice,
• movement,
• communication,
• attribute,
• approach,
• thing,
• interaction,
• failure,
• episode,
• fate,
• measure,
• kingdom,
• world,
• cycle,
• action,
• experience,
• knowledge,
• alteration,
• modification,
• system,
• entity,
• shift,
• adjustment,
• selection,