Modifiers matching rock:

• nonporous,
• hard,
• sedimentary,
• polyphase,
• alkaline,
• acid,
• metamorphic,
• weak,
• volcanic,
• permeable,
• plutonic,
• firm,
• smooth,
• igneous,
• softer,
• flying,
• difficult,
• chemical,
• reactive,
• sedentary,
• intermediate,
• non-porous,
• porous,
• noble,
• soft,
• crustal,
• small,
• crystalline,
• natural,
• fine,
• resistant,
• glassy,
• colorful,
• underlying,
• available,
• uniform,
• vitreous,
• granular,
• stronger,
• impermeable,
• clastic,
• ordinary,
• lightweight,
• crushed,
• siliceous,
• deleterious,
• bituminous,
• intrusive,
• base,
• geological,
• primary,
• powdered,
• competent,
• heterogeneous,
• planetary,
• salt,
• local,
• acidic,
• rough,
• visible,
• refractive,
• inert,
• good,
• british,
• terrestrial,
• insoluble,
• coloured,
• tight,
• compact,
• harder,
• strong,
• conductive,
• calcareous,
• ductile,
• artificial,
• azonic,
• rigid,
• covered,
• frozen,
• brittle,
• useful,
• dry,
• dense,
• hot,
• anisotropic,
• precious,
• basic,
• unconsolidated,
• reflective,
• stable,
• elastic,
• older,
• modern,
• extrusive,
• normal,
• typical,
• friable,
• dated,
• polycrystalline,
• suitable,
• smaller,
• soluble,
• unstable,
• coarse,
• unusual,
• looking,
• magnetic,
• korean,
• flat,
• russian,
• white,
• heavy,
• heated,
• impervious,
• massive,
• surrounding,
• red,
• refractory,
• spherical,
• industrial,
• virgin,
• sticky,
• molten,
• original,
• colored,
• sharp,
• simple,
• solid,
• geologic,
• ingenious,
• aluminous,
• rich,
• lighter,
• homogeneous,
• dark,
• indigenous,
• free,
• angular,
• metallic,
• consolidated,
• large,
• native,
• carbonaceous,
• exotic,
• combustible,
• flinty,
• size,
• tough,
• common,
• enough,
• egyptian,
• polished,
• eruptive,
• widespread,
• decorative,
• marine,
• textured,
• related,
• fragile,
• heavier,
• weaker,
• traditional,
• barren,
• abrasive,
• subsurface,
• extraterrestrial,
• ornamental,
• organic,
• new,
• pulverized,
• hardest,
• crumbly,
• loose,
• argillaceous,
• fragmented,
• impenetrable,
• isolated,
• durable,
• inappropriate,
• light,
• abundant,
• opaque,

Simple categories matching rigid:

• textile,
• coil,
• material,
• document,
• surface,
• container,
• component,
• filler,
• dressing,
• structure,
• object,
• change,
• cover,
• entity,
• profile,
• piece,
• mechanism,
• body,
• instrument,
• substrate,
• construction,
• mineral,
• article,
• panel,
• cutoff,
• device,
• architecture,
• polymer,
• plastic,
• tool,
• part,
• package,
• foundation,
• item,
• product,
• cylinder,
• macromolecule,
• case,
• post,
• fabric,
• obstacle,
• rock,
• connector,
• matter,
• implement,
• casing,
• protein,
• group,
• appliance,
• tubing,
• stick,
• hitch,
• thermoplastic,
• web,
• base,
• alteration,
• substance,
• pavement,
• boundary,
• thread,
• tissue,
• measure,
• barrier,
• bottle,
• sector,
• strip,
• organ,
• ground,
• fixture,
• motion,
• tube,
• feature,
• transformation,
• packing,
• covering,
• plate,
• element,
• hanger,
• tip,
• finish,
• fastener,
• food,
• bed,
• display,
• shape,
• rod,
• armour,
• form,
• particle,
• fixing,
• member,
• sheet,
• fiber,
• wall,
• block,
• sorbent,
• frame,
• solid,
• lining,
• sphere,
• pipe,
• instrumentation,
• portion,
• plant,
• means,
• fibre,
• connection,
• aggregate,
• vehicle,
• organs,
• floor,
• molecule,
• deck,
• devices,
• insulation,
• deposit,
• representation,
• medium,
• resin,
• matrix,
• airfoil,
• shaft,
• adhesive,
• metal,
• luggage,
• unit,
• carrier,
• layer,
• monomer,
• splint,
• foam,
• system,
• support,
• transparency,
• watercraft,
• appendage,
• cloth,
• movement,
• space,
• paper,
• obstruction,
• class,
• gel,
• boot,
• cement,