Category Nuances for null:

• necessary,
• medical,
• essential,
• spare,
• mundane,
• ongoing,
• fundamental,
• special,
• temporary,
• civic,
• first,
• episodic,
• veterinary,
• related,
• military,
• challenging,
• additional,
• extensive,
• new,
• specialized,
• fraternal,
• general,
• individual,
• professional,
• critical,
• clinical,
• basic,
• external,
• miscellaneous,
• practical,
• outdoor,
• immediate,
• personal,
• technical,
• humanitarian,
• ancillary,
• logistic,
• free,
• athletic,
• preventive,
• safe,
• supporting,
• important,
• cool,
• relevant,
• curative,
• traditional,
• formal,
• direct,

Simple Categories for null:

• organisation,
• training,
• stuff,
• duty,
• service,
• work,
• resource,
• aid,
• relief,
• practice,
• part,
• activity,
• assistance,
• care,
• procedure,
• education,
• accommodation,
• support,
• treatment,
• event,
• knowledge,
• nature,
• task,
• project,
• action,
• mission,