Modifiers matching gas:

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

Simple categories matching harmless:

• salt,
• substance,
• critter,
• prey,
• animal,
• plant,
• material,
• matter,
• creature,
• medication,
• fluid,
• contaminant,
• being,
• rodent,
• thing,
• organism,
• insect,
• preparation,
• powder,
• gas,
• object,
• metabolite,
• activity,
• item,
• crime,
• carrier,
• liquid,
• bird,
• ingredient,
• preservative,
• pollutant,
• stuff,
• sugar,
• solid,
• agent,
• residue,
• chemical,
• foodstuff,
• compound,
• bug,
• disorder,
• snake,
• allergen,
• impurity,
• particle,
• souvenir,
• drug,
• neighbor,
• antigen,
• component,
• constituent,
• spider,
• metal,
• food,
• task,