Category Nuances for null:

• diverse,
• valuable,
• transparent,
• hollow,
• inexpensive,
• usable,
• bulky,
• new,
• specialized,
• inorganic,
• reusable,
• home,
• useful,
• fixed,
• closed,
• portable,
• experimental,
• clear,
• plastic,
• ancillary,
• heavy,
• miscellaneous,
• essential,
• domestic,

Simple Categories for null:

• article,
• thing,
• object,
• container,
• device,
• surface,
• box,
• equipment,
• structure,
• item,