Category Nuances for null:

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

Simple Categories for null:

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