Modifiers matching fuel:

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

Simple categories matching unprocessed:

• grain,
• material,
• food,
• fibre,
• cereal,
• ingredient,
• fuel,
• item,
• commodity,
• edible,
• fat,
• substance,
• meat,
• legume,
• seafood,
• plant,
• seed,
• wood,
• textile,
• source,
• particle,
• product,
• oilseed,