Simple categories matching tough:

• hide,
• herb,
• stain,
• situation,
• material,
• thing,
• fish,
• plastic,
• food,
• junk,
• annual,
• surface,
• appendage,
• paper,
• substance,
• exercise,
• job,
• case,
• toy,
• shrub,
• resin,
• subject,
• fruit,
• metal,
• textile,
• workwear,
• animal,
• soil,
• tile,
• plant,
• area,
• polymer,
• part,
• item,
• location,
• fabric,
• bronze,
• topic,
• vine,
• seed,
• issue,
• decision,
• iron,
• condition,
• leaf,
• fibre,
• veggie,
• perennial,
• stone,
• fiber,
• solid,
• structure,
• meat,
• group,
• spice,
• application,
• sheet,
• times,
• rock,
• grass,
• residue,
• state,
• alloy,
• industry,
• object,
• contaminant,
• hardwood,
• wood,
• vegetable,
• substrate,
• coating,
• tissue,
• stuff,

Members with property tough:

• titanium,
• cuticle,
• grease,
• neck,
• tree,
• drug_use,
• cooper_ligament,
• glasses,
• faith,
• catmint,
• nylon,
• adrenal_gland,
• oil,
• wood,
• dolomite,
• politics,
• paint,
• plastic,
• fingernail,
• truck,
• lime,
• urban_education,
• carrot,
• scallop,
• manganese,
• metal,
• sweet_pea,
• japanese_aralia,
• hands,
• tough_meat,
• pension,
• acrylic,
• floor_tile,
• stringy_connective,
• grass_leaf,
• diamond_coating,
• plaster,
• meat_industry,
• death,
• bronze,
• perception,
• polymer,
• yellowtail,
• porphyry,
• abs,
• asphalt,
• economics,
• zombie_flesh,
• horse,
• pet_stain,
• basalt,
• smear,
• mollusk_shell,
• flame,
• bicycle_grease,
• popcorn,
• lipstick,
• stroke,
• large_beet,
• crustacean,
• pod_fig,
• cartilage,
• fibrous_meat,
• medical_ethics,
• java_security,
• sales_job,
• upper_abdomen,
• twig,
• frozen_food,
• finger_oil,
• manilla,
• vibration,
• fatigue,
• triceps,
• rider_gear,
• alcoholism,
• collar_soil,
• webbing_textile,
• granite,
• chemistry,
• persistent_question,
• poor_soil,
• automotive_grease,
• trash_room,
• music_theory,
• deep_mud,
• honeysuckle,
• cast_steel,
• math,
• bioethics,
• thick_shrub,
• bagel,
• turtle_shell,
• mild_steel,
• french_baguette,
• demolition_debris,
• dried_squid,
• pinecone,
• current_drought,
• government,
• bridle_leather,
• aircraft_belly,
• high_humidity,
• feedback_control,
• sausage,
• wrongful_death,
• java_fern,
• wild_boar,
• polyester,
• bean,
• upholstery_fabric,
• polypropylene,
• labour_market,
• indian,
• big_fish,
• race_relations,
• iron,
• accounting,
• steel_bronze,
• education,
• oak,
• religious_study,
• food_soil,
• hair,
• horsehead,
• steel_alloy,
• sexual_obsession,
• hard_rubber,
• carbon,
• abuse,
• nursery,
• cardboard,
• nickel,
• lineman,
• white_object,
• foreign_policy,
• construction,
• pizza,
• civil_engineering,
• persian_darnel,
• stone,
• meat,
• lignin,
• teeth,
• hot_dog,
• sea_ice,
• mold,
• swede_iron,
• stove_part,
• insect_exoskeleton,
• bones,
• nylon_jacket,
• vegetable,
• article,
• cattail,
• sweet_potato,
• lens_port,
• heat,
• snow_daisy,
• ideal,
• vine,
• tungsten,
• heavy_cotton,
• aluminium,
• java_moss,
• marble,
• loose_screw,
• wild_rose,
• tar_oil,
• ornamental_grass,
• chromium,
• stainless,
• heart,
• spring_steel,
• cornea,
• hard_sausage,
• coriander,
• driveway,
• flax,
• rough_cattle,
• fleece_sweatshirt,
• clay_tablet,
• departmental_politics,
• financial_hardship,
• potato,
• paper_industry,
• organic_soil,
• lobster,
• doughy_bread,
• inconel_alloy,
• heavy_shadow,
• border_security,
• cattle_skin,
• aluminium_alloy,
• sinew,
• stucco,
• elytron,
• zircon,
• glue,
• toe,
• beam,
• grass,
• bridge_construction,
• wood_work,
• ligament,
• gum,
• turnip,
• refusal,
• mt,
• moose,
• science,
• glass,
• hedge,
• geometry,
• titanium_alloy,
• slab,
• manzanita,
• kitchen,
• love,
• pasteboard,
• sedum,
• counter_top,
• carbon_fibre,
• choice,
• berry_stain,
• zirconia_oxide,
• hard_nylon,
• god,
• immigration_policy,
• hamburger,
• concrete,
• topaz,
• fence,
• zinnia,
• thermodynamics,
• low_light,
• dentin,
• beryllium_copper,
• garnet,
• fruit,
• titanium_nitride,
• derogatory_terms,
• elbow,
• fake_leather,
• trust,
• tungsten_carbide,
• ink,
• rose,
• apple,
• nordic_climate,
• rule,
• fascia,
• cold,
• lattice,
• paper_stock,
• mission_field,
• chuck,
• tea_stain,
• wolf,
• poultry,
• copper,
• sheet-metal_piece,
• maple,
• wool,
• hospitalization,
• heel,
• upper_arms,
• police,
• slate,
• dirt,
• concert-hall_impulse,
• foxtail,
• government_representation,
• anger,
• suede,
• carbon_smudge,
• jean,
• cattle,
• temptation,
• denim,
• chrysoberyl,
• water_discoloration,
• ballistic_nylon,
• beef,
• cauliflower,
• high-temperature_alloy,
• infrastructure_protection,
• snowberry,
• walnut,
• wall_surface,
• greasy_dirt,
• waist,
• security,
• bully,
• tuna,
• agate,
• entitlement,
• buttocks,
• brass,
• polyester_webbing,
• polyethylene,
• pit,
• bacon,
• leather_portfolio,
• carbon_fiber,
• steel,
• family_heartache,
• pumpkin,
• pillar,
• leopard_stone,
• building,
• religion,
• caraway,
• lantana,
• fiberglass,
• sisal_fibre,
• tummy,
• yucca,
• hickory,
• beech,
• pea,
• upholstery_selection,
• grime,
• late_night,
• rag,
• ore,
• hip,
• salad_vegetable,
• spinach_stem,
• uranium,
• nacre,
• bowel,
• aluminum_alloy,
• foot,
• cobalt,
• leaf,
• demand,
• leather,
• abdomen,
• aerospace_aluminum,
• gneiss,
• length,
• pain,
• lepidolite,
• bamboo,
• large_mush,
• epoxy,
• small_space,
• spinel,
• gas_grill,
• smooth_muscle,
• rhino_hide,
• drought,
• chicken,
• steak,
• soil_science,
• soil,
• alzheimers,
• algebra,
• such_material,
• christmas,
• white_gold,
• cellulose,
• fowl,
• fescue,
• calif_yellowtail,
• toilet,
• part,
• television,
• oven,
• tent,
• pork,
• coffee_stain,
• palm-nut_shell,
• dry_skin,
• building_type,
• expanded_pvc,
• muscle,
• replacement_power,
• humidity,
• bottom,
• food_grease,
• tar,
• extreme_heat,
• fact,
• pansy,
• spruce_cone,
• metal_fiber,
• corduroy,
• canvas,
• cast_zinc,
• sexual_politics,
• leg,
• juice_stain,
• fire,
• multiculturalism,
• tomato,
• silicone,
• polyurethane_film,
• thimbleberry,
• stewing_meat,
• polypropylene_resin,
• white_oak,
• rock,
• woody_nut,
• economic_development,
• bone,
• tobacco_stain,
• geography,
• condom_use,
• hardship,
• ryegrass,
• umbrella,
• raw_carrot,
• elm,
• quartzite,
• lung,
• parchment_paper,
• marine_enamel,
• dryness,
• quackgrass,
• soy-sauce_stain,
• zinc,
• aircraft-engine_control,
• cantaloupe,
• clay,
• stem,
• sclera,
• noodle,
• thorium,
• primrose,
• aluminum,
• label_glue,
• campaign_finance,
• ethics,
• apple_wood,
• daylily,
• tarmac,
• seed,
• mining,
• blood_stain,
• diorite,
• shock,
• heather,
• traffic_paint,
• serious_illness,
• corn_seed,
• protein_soil,
• bent-grass,
• single_science,
• beryllium,
• vessel,
• solitude,
• fruit_stain,
• pea_outside,
• function_notation,
• garage,
• serviceberry,
• cinnamon_stick,
• cement,
• sleeve,
• physics,
• chitin,
• broad_bean,
• budget,
• cramped_display,
• gorse,
• biceps,
• magnolia,
• urethane,
• quartz,
• workplace,
• old_rabbit,
• horn,
• hemp,
• forest_wild,
• operational_change,
• broccoli,
• phlox,
• tendon,
• polyurethane,
• marine_paint,
• sheet_aluminum,
• apparel,
• balata,
• fibrous_vegetable,
• brazilian_agate,
• skin,
• copper_alloy,
• property,
• limestone,
• eggplant,
• resin,
• bracken,
• exposure,
• work_style,
• grill,
• lancewood,
• asparagus,
• rubber,
• hide,
• harder_steel,
• rope,
• coyote,
• parsley,
• micro_fiber,
• linen,
• bratwurst,
• crabgrass,
• beryllium_nickel,
• alcohol_use,
• ceramics,
• shell,
• grass_stain,
• chrome,
• roster_move,
• trigonometry,
• pluralism,
• building_work,
• sexual_abuse,
• japanese_paper,
• artichoke,
• anatomy,
• curtain,
• abandoned_hen,
• inconel,
• stainless-steel_sheet,
• squat,
• alloy,
• discipline,
• hemp_fibre,
• abrasion,
• japanese,
• hallway,
• sternum,
• food_stain,
• pvc,
• thallium,