Modifiers matching gas:

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

Simple categories matching propellant:

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