Simple categories matching unstable:

• apparatus,
• community,
• earth,
• surface,
• object,
• portion,
• item,
• chemical,
• form,
• material,
• weather,
• phenomenon,
• article,
• substrate,
• component,
• molecule,
• particle,
• period,
• system,
• vehicle,
• mineral,
• grain,
• stone,
• structure,
• container,
• gas,
• place,
• medium,
• ground,
• protein,
• operation,
• solid,
• network,
• location,
• furniture,
• artifact,
• fabric,
• terrain,
• lubricant,
• assembly,
• formation,
• support,
• soil,
• star,
• aircraft,
• compound,
• control,
• event,
• substance,
• basin,
• situation,
• slope,
• region,
• matter,
• rock,
• equipment,
• elements,
• elevation,

Members with property unstable:

• barrels,
• vehicle,
• box,
• book,
• iaa,
• shale,
• snow,
• hormone,
• porous_silicon,
• wall,
• knit_shirt,
• water_shortage,
• concrete_block,
• loose_brick,
• virus,
• cycle,
• phenothiazine,
• superoxide,
• roof,
• ip_network,
• swiss_ball,
• balance_pad,
• latex,
• gypsum,
• arctic_permafrost,
• wireless_network,
• unicycle,
• newsprint,
• butadiene,
• bottle,
• acetone,
• table,
• fire,
• ladder,
• casement_fabric,
• top,
• hill,
• mercury,
• wet_clay,
• inclined_location,
• wall_shelf,
• mirror_machine,
• earth,
• metallic_perchlorate,
• peptide,
• cliff,
• nitroglycerine,
• fabric,
• loose_stone,
• former_state,
• cable_dome,
• inclined_place,
• siltstone,
• tornado,
• slant_surface,
• waste_rock,
• wifi,
• amphibole,
• soft_clay,
• settled_grain,
• loose_sand,
• cesium,
• south,
• flood,
• dwarf_nova,
• broken_rock,
• active_floodplain,
• plastic_container,
• plagioclase,
• surface_water,
• sulphide,
• chipboard,
• radioactive_atom,
• quicksand,
• bromide,
• brick,
• stairs,
• laterite,
• nitric_oxide,
• ozone_gas,
• methyl_chloride,
• wood,
• organic_peroxide,
• multiple_star,
• hornblende,
• dead_branch,
• roller,
• stannic_nitrate,
• derivative,
• marine_clay,
• heat,
• cushion,
• block,
• walking_robot,
• dirt,
• mica,
• star,
• manganese,
• protein,
• membrane,
• cultural_conflict,
• rug,
• peroxide,
• turbulent_water,
• swamp_area,
• unstable_table,
• fresh_moraine,
• enzyme,
• mat,
• water,
• container,
• gusty_wind,
• icy_rock,
• pneumatic_structure,
• starch,
• tropics,
• cracked_path,
• biotite,
• deep_sand,
• cart,
• pill_box,
• serum,
• plutonium,
• disk,
• sandbag,
• oxidized_ldl,
• shelf,
• rock,
• gravel,
• unstable_bench,
• organic_soil,
• sulfur,
• fragile_site,
• helicopter,
• water_body,
• air,
• firm_pillow,
• plank,
• plastic_clay,
• riot,
• tnt,
• nitrocellulose,
• arctic_tundra,
• log,
• adhesive,
• grease,
• plutonium_metal,
• scree,
• magnetic_blow,
• chair,
• tilted_place,
• stroke,
• powder,
• organic_material,
• oscillation,
• hunting,
• bookcase,
• small_boat,
• emulsion,
• dolomite,
• slanted_surface,
• couch,
• giant_ball,
• mud,
• free_radical,
• inclined_floor,
• petroleum_hydrocarbon,
• bottle_pack,
• natural_disaster,
• dresser,
• creatine,
• wetland,
• protein_drug,
• certain_pesticide,
• pyrites,
• sarcophagus_roof,
• vial,
• protease,
• organic_polymer,
• ferrocyanide,
• vase,
• landscape_area,
• soft_soil,
• peat,
• balance_cushion,
• mountain,
• charcoal,
• dust,
• band,
• foam_surface,
• deep_layer,
• arsenic,
• internet,
• asphalt,
• brittle_book,
• shetland_island,
• inner_city,
• loose_tile,
• topsoil,
• isocyanate,
• weak_base,
• sand_stone,
• ice,
• organdie,
• olivine,
• chemical,
• derivative_market,
• americium,
• feldspar,
• rolling_chair,
• tire,
• mini_trampoline,
• hydrazine,
• rooftop,
• atmosphere,
• steep_slope,
• carbon,
• pole-vault_pit,
• middle,
• stone,
• thick_clay,
• organic,
• balance_board,
• carbonate,
• oxide,
• bed,
• acetylene,
• disaster,
• antibiotic,
• oil,
• ceiling_fan,
• sphere,
• al,
• cataclysmic_variable,
• permafrost,
• tilted_surface,
• expansive_clay,
• high_wind,
• balance,
• spring,
• cupcake,
• hydrogen_gas,
• nucleotide,
• polymer_sheet,
• iron,
• trampoline,
• tricot,
• aragonite,
• ethylene,
• pet_bottle,
• pique,
• nitrate,
• gymnastic_ball,
• stability_ball,
• rocker,
• heavy_pipe,
• earth_atmosphere,
• glassware,
• aluminum,
• swelling_clay,
• clathrate_compound,
• dead_cell,
• scrap_lumber,
• suspension,
• couch_cushion,
• oligosaccharide,
• wobbly_chair,
• balance_disc,
• similar_object,
• petroleum,
• clay,
• stretch_knit,
• calcite_cement,
• knit,
• explosive,
• deep_snow,
• mutant_protein,
• stability_trainer,
• gulf-coast_basin,
• slough,
• landslide,
• fitness_ball,
• weathered_clay,
• reactive_clay,
• slant_board,
• debris,
• foam_mat,
• northeast,
• radical,
• river_bed,
• drapery,
• ball,
• color,
• naphthoquinone_sulfonate,
• rickety_chair,
• casein,
• black_gumbo,
• pyroxene,
• basalt,
• cable,
• moving_escalator,
• exercise_ball,
• methane,
• trinitrotoluene,
• soft_mattress,
• cloud,
• expansive_soil,
• natural_gas,
• metal,
• bicycle,
• slippery_ice,
• excited_molecule,
• springy_bed,
• blood,
• carbon_fibre,
• pillow,
• alpine_area,
• pit_wall,
• bleach,
• paper,
• flame,
• masonite,
• loose_soil,
• patio_stone,
• sand,
• feldspar_grain,
• foam_pad,
• biological_compound,
• tool,
• wind,
• shifting_soil,
• organic_acid,
• ether_peroxide,
• nitroglycerin,
• steeple,
• wet_sand,
• pallet,
• greece,
• silt,
• variable,
• humidity_level,
• marshland,
• wobbly_mount,
• atom,
• thunderstorm,
• sugar,
• carbohydrate,
• balance_disk,
• granite,
• rain,
• west,
• shaky_table,
• grain,
• palestinian_territory,
• foam_roller,
• ampoule,
• rocker_board,
• canvas,
• crockery_start,
• polymer,
• ethylene_oxide,
• fuel_tank,
• monomer,
• torn_carpet,
• mattress,
• carpet,
• sea_bed,
• calcite_limestone,
• soft_mat,
• alum,
• foam_cushion,
• nitrogen_iodide,
• bathroom_tile,
• limestone,
• gulf,
• pure_limestone,
• ozone,
• unsteady_platform,
• aldehyde,
• ship_deck,
• vitamin,
• leather,
• swimming_tank,
• pit,
• textile,
• keg,