Category Nuances for null:

• heavy,
• dietary,
• ductile,
• metallic,
• environmental,
• several,
• skeletal,
• toxic,
• ordinary,
• dissolved,
• colored,
• common,
• pure,
• hard,
• oxidizable,
• volatile,
• monovalent,
• stable,
• binding,
• interfering,
• conductive,
• thick,
• traditional,
• diamagnetic,
• valuable,
• nonmagnetic,
• central,
• inexpensive,
• available,
• persistent,
• electrical,
• elemental,
• heterogeneous,
• fine,
• soft,
• model,
• hybrid,
• mobile,
• thermal,
• familiar,
• starting,
• urban,
• soluble,
• symmetric,
• brittle,
• new,
• colour,
• primary,
• conventional,
• reflective,
• foreign,
• hazardous,
• electric,
• raw,
• crystalline,
• usual,
• important,
• single,
• minor,
• active,
• paramagnetic,
• cheaper,
• good,
• key,
• domestic,
• light,
• isotopic,
• bivalent,
• native,
• alternative,
• desirable,
• divalent,
• noble,
• possible,
• electronic,
• special,
• polyvalent,
• typical,
• airborne,
• liquid,
• real,
• endogenous,
• individual,
• expensive,
• resistant,
• magnetic,
• monoatomic,
• ceramic,
• small,
• simple,
• corrosive,
• carcinogenic,
• abundant,
• poisonous,
• opaque,
• refractory,
• iron,
• normal,
• practical,
• inorganic,
• intermediate,
• melting,
• cubic,
• textured,
• useful,
• medium,
• valent,
• compliant,
• particulate,
• surrounding,
• diffusing,
• sensitive,
• acid,
• catalytic,
• amorphous,
• anodic,
• reactive,
• inert,
• rare,
• cationic,
• metal,
• polycrystalline,
• harmful,
• structural,
• standard,
• heavier,
• resistive,
• chemical,
• size,
• unwanted,
• isotropic,
• technological,
• underlying,
• flexible,
• electrochemical,
• larger,
• polished,
• basic,
• exotic,
• dangerous,
• softer,
• cheap,
• multiple,
• carbonaceous,
• essential,
• solid,
• specified,
• precious,
• serial,
• free,
• powdered,
• suitable,
• strategic,
• suspended,
• lighter,
• molten,

Simple Categories for null:

• metal,
• chemical,
• material,
• group,
• measure,
• contamination,
• matter,
• si,
• system,
• contaminant,
• tm,
• sediment,
• substrate,
• particle,
• entity,
• connection,
• activator,
• oxygen,
• substance,
• element,
• amount,
• conductor,
• affinity,
• solid,
• np,
• attribute,
• rock,
• precursor,
• mineral,
• waste,
• component,
• particulate,
• constituent,
• atom,