Modifiers matching gas:

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

Simple categories matching propellant:

• gas,
• material,
• fuel,
• constituent,
• compound,
• component,
• system,
• region,