Modifiers matching steel:

• cold,
• refined,
• dissimilar,
• exotic,
• metal,
• special,
• alloyed,
• hard,

Simple categories matching hard:

• animal,
• material,
• surface,
• cheese,
• exercise,
• format,
• ligand,
• hardwood,
• object,
• tissue,
• language,
• original,
• mineral,
• wood,
• conveyance,
• fiber,
• particle,
• fish,
• veg,
• stone,
• rock,
• ware,
• attribute,
• fastening,
• job,
• liquor,
• part,
• ingredient,
• drug,
• point,
• hydrocarbon,
• steel,
• nut,
• form,
• labour,
• maple,
• condition,
• data,
• pavement,
• place,
• coating,
• component,
• system,
• nonmetal,
• hat,
• times,
• crime,
• toy,
• vegetable,
• resin,
• engineering,
• issue,
• fat,
• bone,
• input,
• seed,
• furnishing,
• abrasive,
• fruit,
• assets,
• fastener,
• pad,
• fibre,
• starches,
• appliance,
• ball,
• candy,
• boundary,
• button,
• equipment,
• track,
• feature,
• grain,
• dog,
• lolly,
• sheet,
• indicator,
• commodity,
• characteristic,
• grass,
• power,
• feed,
• sport,
• room,
• tree,
• bronze,
• insulator,
• benefit,
• filler,
• fixing,
• incentive,
• structure,
• constraint,
• essence,
• piece,
• monomer,
• yarn,
• spirits,
• pine,
• bones,
• mask,
• implement,
• time,
• tag,
• acid,
• variable,
• device,
• mode,
• region,
• butter,
• procedure,
• body,
• problem,
• choice,
• foodstuff,
• alloy,
• ore,
• adhesive,
• instrument,
• portion,
• coal,
• edge,
• sweet,
• matter,
• landscaping,
• labor,
• armour,
• brush,
• clay,
• narcotic,
• use,
• water,
• acceleration,
• science,
• epithelium,
• prey,
• devices,
• medication,
• floor,
• disease,
• investment,
• artifact,
• activity,
• pipe,
• training,
• panel,
• apple,
• reference,
• evidence,
• control,
• elastomer,
• plastic,
• fact,
• law,
• pen,
• chemical,
• rule,
• failure,
• alcohol,
• soil,
• item,
• defence,
• packing,
• disk,
• aspect,
• disturbance,
• event,
• armor,
• tool,
• crystal,
• impediment,
• residue,
• particulate,
• board,
• beads,
• furniture,
• tick,
• space,
• subject,
• fabric,
• scale,
• block,
• organism,
• notebook,
• ferrite,
• booze,
• target,
• technology,
• cover,
• works,
• substance,
• copy,
• spice,
• knowledge,
• infrastructure,
• key,
• formation,
• softwood,
• base,
• layer,
• ion,
• meat,
• connection,
• glass,
• bottom,
• washer,
• workout,
• unit,
• biscuit,
• appendage,
• medium,
• instrumentality,
• rubber,
• segment,
• ground,
• fault,
• vehicle,
• laser,
• bottle,
• lump,
• backing,
• fuel,
• grit,
• substrate,
• professional,
• metal,
• constituent,
• flooring,
• ip,
• stuff,
• barrier,
• sausage,
• cracker,
• drink,
• skill,
• scientist,
• quartz,
• wax,
• contaminant,
• thermoplastic,
• area,
• mast,
• access,
• sector,
• gem,
• wedge,
• article,
• gemstone,
• deposit,
• outcome,
• wheat,
• wealth,
• plate,
• beverage,
• film,
• straw,
• institution,
• needle,
• powder,
• oxide,
• information,
• case,
• projectile,
• coral,
• insect,
• confectionery,
• veggie,
• paper,
• study,
• waste,
• discipline,
• identification,
• matrix,
• possession,
• rind,
• obstruction,
• commitment,
• papers,
• work,
• service,
• helmet,
• content,
• measure,
• container,
• wire,
• stain,
• carbon,
• output,
• aggregate,
• belt,
• protein,
• weapon,
• lure,
• product,
• bait,
• utensil,
• profession,
• capital,
• food,
• wall,
• compound,
• detector,
• info,
• shell,
• drive,
• solid,
• thing,