Category Nuances for null:

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

Simple Categories for null:

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