Category Nuances for null:

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

Simple Categories for null:

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