Modifiers matching gas:

• classical,
• refrigerant,
• propellant,
• inert,
• rare,
• combustible,
• pure,
• interfering,
• atmospheric,
• supercritical,
• noble,
• indoor,
• suffocating,
• electropositive,
• transparent,
• volatile,
• elemental,
• insoluble,
• industrial,
• chemical,
• cheap,
• toxic,
• frozen,
• under,
• noncombustible,
• explosive,
• acidic,
• commercial,
• malodorous,
• dilute,
• flammable,
• clean,
• environmental,
• medical,
• damaging,
• light,
• liquefied,
• protective,
• rarefied,
• incombustible,
• dense,
• inexpensive,
• lighter,
• safe,
• carbonaceous,
• injurious,
• vital,
• metabolic,
• relativistic,
• external,
• vesicant,
• particular,
• heated,
• key,
• miscellaneous,
• mobile,
• starting,
• automotive,
• irritating,
• abundant,
• detrimental,
• dangerous,
• innocuous,
• supplemental,
• scientific,
• nonpolar,
• beneficial,
• medicinal,
• mental,
• complex,
• out,
• single,
• secondary,
• diatomic,
• common,
• impure,
• foreign,
• soluble,
• ambient,
• extraneous,
• paramagnetic,
• harmful,
• noxious,
• anthropogenic,
• lightweight,
• monatomic,
• polar,
• neutral,
• saturated,
• supportive,
• stable,
• warming,
• oxidative,
• basic,
• strong,
• divalent,
• poisonous,
• acid,
• active,
• diffusing,
• organic,
• hazardous,
• biogenic,
• inorganic,
• off,
• useful,
• atomic,
• airborne,
• unwanted,
• base,
• deleterious,
• minor,
• incoming,
• liquified,
• corrosive,
• standard,
• reactive,
• technical,
• relevant,
• conventional,
• benign,
• hydrophobic,
• radioactive,
• artificial,
• absorptive,
• undesirable,
• electronegative,
• compressible,
• invisible,
• aggressive,
• respiratory,
• major,
• familiar,
• valuable,
• oxidizable,
• monoatomic,
• suitable,
• cryogenic,
• popular,
• essential,
• molecular,
• additional,
• nonflammable,
• residual,
• fast,
• simple,
• dusty,
• liquid,
• rich,
• passive,
• mixed,
• special,
• separate,
• heavy,
• auxiliary,
• supporting,
• surrounding,
• working,
• available,
• natural,
• controlled,
• nontoxic,
• medium,
• identifiable,
• tenuous,
• carcinogenic,
• traditional,
• metal,
• manufactured,
• hot,
• raw,
• hydrophilic,
• weak,
• ignitable,
• conductive,
• permanent,
• fixed,
• luminous,
• ionic,
• critical,
• cold,
• number,
• dissolved,
• compressed,
• thin,
• model,
• warm,
• obnoxious,
• consumable,
• unique,
• small,
• diamagnetic,
• dry,
• convenient,
• inflammable,
• harmless,
• faster,
• synthetic,
• heavier,
• individual,
• real,
• moving,
• alkaline,
• unstable,
• ordinary,
• unsaturated,
• sulfurous,
• floating,
• malign,
• important,
• refrigerated,
• edible,
• expensive,
• deadly,
• desirable,
• buoyant,

Simple categories matching radioactive:

• surface,
• material,
• decay,
• ore,
• substance,
• component,
• metal,
• halogen,
• waste,
• tracer,
• poison,
• drug,
• volatile,
• gas,
• log,
• atom,
• particle,
• isotope,
• solid,
• element,
• contaminant,
• source,
• mineral,
• fluid,
• constituent,
• liquid,
• substrate,
• article,