Modifiers matching fuel:

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

Simple categories matching supplemental:

• food,
• assistance,
• forage,
• magazine,
• information,
• medication,
• feed,
• fiber,
• material,
• item,
• source,
• fuel,
• particulate,
• tool,
• assay,
• stimulus,
• work,
• text,
• means,
• vitamin,
• instruction,
• expense,
• agent,
• book,
• nutrition,
• criterion,
• section,
• coverage,
• measure,
• vertebrate,
• activity,
• service,
• file,
• gas,
• database,
• sweetener,
• procedure,
• applicator,
• mineral,
• equipment,
• document,
• binder,
• testing,
• component,
• investigation,
• stuff,
• system,
• product,
• content,
• nutrient,
• practice,
• industry,
• support,
• program,
• curriculum,