Modifiers matching fuel:

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

Simple categories matching synthetic:

• fabric,
• material,
• foam,
• solvent,
• contaminant,
• medication,
• ester,
• nutrient,
• polymer,
• drug,
• item,
• fibre,
• siding,
• antagonist,
• pesticide,
• fleece,
• painkiller,
• herbicide,
• ingredient,
• lacquer,
• stone,
• pharmaceutical,
• process,
• precursor,
• silicate,
• gem,
• hallucinogen,
• chemical,
• diamond,
• fuel,
• abrasive,
• wax,
• graphite,
• gemstone,
• glove,
• flavoring,
• oil,
• substance,
• grease,
• carbon,
• latex,
• intermediate,
• insecticide,
• preservative,
• antimalarial,
• stimulant,
• adhesive,
• bristle,
• cloth,
• estrogen,
• coating,
• filament,
• textile,
• product,
• polyamide,
• peptide,
• fertilizer,
• rope,
• medium,
• compound,
• anesthetic,
• resin,
• hydrocarbon,
• antimicrobial,
• nsaid,
• condition,
• fiber,
• cortisone,
• papers,
• object,
• sweetener,
• fertiliser,
• undergarment,
• agent,
• lubricant,
• work,
• fluid,
• particle,
• cure,
• anticoagulant,
• structure,
• ligand,
• component,
• glue,
• plastic,
• agonist,
• elastomer,
• paint,
• frame,
• opal,
• food,
• oestrogen,
• crystal,
• gum,
• antibiotic,
• enzyme,
• mineral,
• antidepressant,
• oxide,
• filler,
• source,
• leather,
• fumigant,
• progestogen,
• scale,
• copolymer,
• membrane,
• progestin,
• equipment,
• unit,
• aggregate,
• molecule,
• clothing,
• starch,
• medicine,
• yarn,
• sound,
• gene,
• layer,
• surface,
• wig,
• activity,
• glucocorticoid,
• event,
• reaction,
• cosmetic,
• steroid,
• hormone,
• document,
• entity,
• topaz,
• progesterone,
• opiate,
• vector,
• androgen,
• narcotic,
• phenomenon,
• pigment,
• clothes,
• penicillin,
• equity,
• nature,
• macromolecule,
• micronutrient,
• system,
• amphetamine,
• thing,
• sedative,
• gas,
• cortisol,
• flooring,
• insulator,
• solid,
• instrument,
• part,
• substrate,
• input,
• pianoforte,
• corticosteroid,
• carrier,