Category Nuances for null:

• pure,
• inflammable,
• liquified,
• inert,
• nonflammable,
• light,
• liquefied,
• simple,
• biogenic,
• dry,
• diffusing,
• nutritive,
• important,
• frozen,
• inorganic,
• base,
• minor,
• noble,
• benign,
• stable,
• external,
• mobile,
• compressible,
• natural,
• nutrient,
• electronegative,
• elemental,
• structural,
• smaller,
• unhealthy,
• diatomic,
• undesirable,
• invisible,
• industrial,
• ambient,
• scientific,
• nutritional,
• deleterious,
• propellant,
• renewable,
• hydrophilic,
• intermediate,
• biodegradable,
• cheaper,
• auxiliary,
• protective,
• biochemical,
• cheap,
• metalloid,
• main,
• environmental,
• gaseous,
• poisonous,
• dangerous,
• unwanted,
• conventional,
• heavier,
• working,
• incombustible,
• toxic,
• beneficial,
• relevant,
• refrigerated,
• technical,
• model,
• numerous,
• warm,
• solid,
• harmful,
• side,
• third,
• covalent,
• saturated,
• familiar,
• polyvalent,
• compressed,
• nonpolar,
• pathogenic,
• polar,
• gross,
• impure,
• dietary,
• nontoxic,
• fixed,
• rare,
• reactive,
• hot,
• diamagnetic,
• noxious,
• available,
• free,
• expensive,
• atmospheric,
• atomic,
• mixed,
• noncombustible,
• critical,
• valuable,
• residual,
• common,
• desirable,
• hazardous,
• particular,
• isotopic,
• foreign,
• active,
• special,
• heated,
• controlled,
• suspended,
• major,
• interfering,
• organic,
• nutritious,
• soluble,
• safe,
• dilute,
• functional,
• solar,
• abundant,
• flammable,
• extraneous,
• central,
• stimulating,
• small,
• inanimate,
• rich,
• volatile,
• raw,
• heterogeneous,
• corrosive,
• cold,
• innocuous,
• refrigerant,
• combustible,
• suitable,
• unconventional,
• cryogenic,
• harmless,
• electropositive,
• skeletal,
• large,
• respiratory,
• key,
• heavy,
• inexpensive,
• heterocyclic,
• consumable,
• passive,
• medical,
• out,
• dense,
• nonmetallic,
• basic,
• supplemental,
• nitrogenous,
• individual,
• charged,
• essential,
• medicinal,
• transparent,
• monoatomic,
• convenient,
• liquid,
• supercritical,
• lighter,
• neutral,
• permanent,
• biological,
• particulate,
• anthropogenic,
• insoluble,
• explosive,
• standard,
• chemical,
• clean,
• acidic,
• edible,
• complex,
• radioactive,
• significant,
• monatomic,
• single,
• medium,
• dissolved,
• mental,
• molecular,
• larger,
• elastic,
• useful,
• vital,
• number,
• real,
• conductive,
• ordinary,
• cultural,
• thin,

Simple Categories for null:

• volatile,
• stuff,
• mixture,
• atom,
• gas,
• fluid,
• atmosphere,
• material,
• attribute,
• affinity,
• liquid,
• oxygen,
• measure,
• group,
• substrate,
• solute,
• metal,
• constituent,
• solid,
• change,
• entity,
• unit,
• air,
• control,
• quantity,
• component,
• nonmetal,
• object,
• element,
• amount,
• substance,
• matter,
• system,
• hydrogen,
• fumes,