Modifiers matching fuel:

• efficient,
• liquid,
• explosive,
• solid,
• primary,
• common,
• powdered,
• single,
• modern,
• organic,
• artificial,
• combustible,
• foreign,
• granular,
• fibrous,
• compressible,
• propellant,
• beneficial,
• desirable,
• base,
• taxable,
• important,
• homogeneous,
• complex,
• precious,
• traditional,
• rich,
• direct,
• nonpolar,
• light,
• conventional,
• gaseous,
• thinner,
• indigenous,
• alternative,
• oxidizable,
• damaging,
• possible,
• auxiliary,
• up,
• ignitable,
• loose,
• needed,
• synthetic,
• nonwoody,
• abundant,
• compressed,
• raw,
• unconventional,
• small,
• essential,
• discrete,
• main,
• future,
• unhealthy,
• off,
• friendly,
• dirtier,
• innovative,
• typical,
• actual,
• wet,
• unprocessed,
• basic,
• residential,
• nuclear,
• advanced,
• vaporizable,
• lighter,
• supplemental,
• reactive,
• environmental,
• convenient,
• finished,
• heavier,
• destructive,
• available,
• cheap,
• dense,
• ordinary,
• simple,
• competitive,
• individual,
• residual,
• cleaner,
• corrosive,
• toxic,
• inflammable,
• medical,
• harmful,
• strategic,
• metabolic,
• vehicular,
• dangerous,
• major,
• hard,
• unwanted,
• old,
• new,
• hazardous,
• thermal,
• expensive,
• familiar,
• inexpensive,
• diverse,
• dead,
• inhomogeneous,
• costly,
• particular,
• standard,
• technical,
• abrasive,
• automotive,
• down,
• extra,
• specialized,
• volatile,
• motor,
• normal,
• consumable,
• dry,
• heavy,
• fluid,
• natural,
• exotic,
• vegetative,
• difficult,
• special,
• smaller,
• flammable,
• suitable,
• local,
• practical,
• starting,
• appropriate,
• intermediate,
• physiological,
• commercial,
• usable,
• commonplace,
• cryogenic,
• biological,
• carbonaceous,
• key,
• nonrenewable,
• sensitive,
• several,
• soluble,
• dirty,
• particulate,
• renewable,
• miscellaneous,
• pure,
• uniform,
• chemical,
• benign,
• manufactured,
• real,
• mundane,
• useful,
• regular,
• secondary,
• macromolecular,
• supporting,
• valuable,
• sustainable,
• clean,
• fine,
• industrial,
• separate,
• indoor,
• porous,
• refined,
• domestic,
• herbaceous,
• safe,
• odd,
• supplementary,

Simple categories matching gaseous:

• substrate,
• fuel,
• anesthetic,
• hydrocarbon,
• plasma,
• substance,
• fumigant,
• alkane,
• salt,
• compound,
• alkyne,
• system,
• impurity,
• fluid,
• monomer,
• waste,
• constituent,
• olefin,
• flow,
• phenomenon,
• matter,
• material,
• component,
• sulphide,
• reactant,
• agent,
• anaesthetic,
• form,
• contaminant,
• body,
• contamination,
• oxide,
• state,
• mass,
• chemical,
• buffer,
• molecule,
• mixture,
• pollutant,
• object,
• cyanide,
• atmosphere,
• carrier,
• medium,
• precursor,
• acid,
• odor,