Simple categories matching irregular:

• period,
• astigmatism,
• shape,
• shelter,
• surface,
• work,
• part,
• pattern,
• unit,
• object,
• terrain,
• dust,
• body,
• polygon,
• expense,
• particle,
• area,
• original,
• line,
• phenomenon,
• system,
• array,
• program,
• asterism,
• feature,
• edge,
• hours,
• material,
• road,
• organ,
• condition,
• commodity,
• curve,
• component,
• week,
• border,
• structure,
• substrate,
• set,
• space,
• payment,
• motion,
• activity,
• wall,
• holiday,
• display,
• flower,
• event,
• obstruction,
• profile,
• light,
• organization,
• place,
• item,
• behavior,
• ground,
• soil,
• form,
• cell,
• interval,
• use,
• boundary,
• odor,
• occurrence,
• connection,
• job,
• solid,

Members with property irregular:

• triangle,
• circle,
• christmas_ornament,
• volumetric_flask,
• ranger,
• consecutive_surface,
• random_array,
• stone,
• hexagon,
• cell,
• pipe,
• uneven_brick,
• open_book,
• crib,
• weekend_hours,
• new_concrete,
• valve,
• pentagon,
• breakdown,
• deviation,
• property-tax_payment,
• night,
• power_loss,
• round_cup,
• filament,
• corner,
• larger_body,
• cloud,
• biomass_material,
• relief,
• octagon,
• door,
• furniture_legs,
• maximum_diameter,
• sample_edge,
• trigger,
• welfare_payment,
• wine_glasses,
• model,
• large_withdrawal,
• bay,
• plant,
• foot,
• dry_season,
• pipe_flange,
• lottery_earnings,
• earth,
• cardboard,
• coffer,
• wavy_line,
• light,
• ditch,
• oscillation,
• pear,
• yard,
• quadrilateral,
• sophisticated_sculpture,
• pillow,
• loess,
• influenza_epidemic,
• heavy_cardboard,
• web,
• horseshoe_pattern,
• human_brain,
• doorjamb,
• curtain_rod,
• plastic_sheeting,
• ocean_wave,
• brick_surface,
• skylight,
• ball,
• horizontal_seam,
• array,
• tube,
• newsprint,
• harvest_period,
• wall,
• string,
• fillet,
• large_size,
• balcony_face,
• rounded_edge,
• position_balance,
• typhoon,
• free_curve,
• maintenance,
• meteor,
• percolation,
• mud,
• shovel,
• thunderstorm,
• house_siding,
• pin_punch,
• asian_dust,
• merger,
• cup,
• apple,
• door_hinge,
• curved_wall,
• cable_support,
• bush_fire,
• school_building,
• box,
• overtime,
• bankruptcy,
• evening,
• bridge_column,
• hippocampus,
• cylinder_vase,
• inside_corner,
• large_area,
• coke,
• curved_fender,
• overtime_allowance,
• roof,
• tree_trimmings,
• ladder,
• fruit_cake,
• sphere,
• minefield,
• round_log,
• agricultural_labour,
• cabinet,
• gravel_road,
• rough_concrete,
• split_block,
• coffee,
• flash,
• tree_crown,
• unpainted_wood,
• cardboard_carton,
• growth,
• wire_mesh,
• wood,
• retroactive_pay,
• bean,
• concrete,
• long_size,
• weekend,
• car_body,
• distal_radius,
• odd_job,
• iron_casting,
• root,
• city_skyline,
• ore_body,
• cloth,
• canoe,
• timber,
• ribbon,
• vehicle_side,
• rock_wall,
• hand,
• cylinder,
• overtime_pay,
• national_election,
• uterus,
• tree_foliage,
• maritime_terrain,
• older_carton,
• potato_shape,
• existing_timber,
• porous_material,
• flint,
• church,
• nose,
• aluminium_door,
• political_boundary,
• incomplete_setup,
• big_stick,
• baseball,
• high_chair,
• face_motion,
• small_box,
• island,
• manufactured_diffusor,
• court_appearance,
• pension,
• induction_event,
• small_folder,
• leaf,
• narrow_cavity,
• pit,
• snow_road,
• brick_wall,
• convoluted_line,
• gun_shot,
• laundering,
• vermicular_pattern,
• sweep,
• tube_break,
• breast,
• movie_production,
• powder,
• rock_joint,
• human_limb,
• wash,
• labour,
• textile,
• acute_edge,
• random_movement,
• grain_boundary,
• os,
• fender,
• terrain,
• iron_powder,
• sanitary_napkin,
• marl_clod,
• abrasive_grit,
• soft_terrain,
• home_maintenance,
• outsized_freight,
• paramilitary,
• nonlinear_movement,
• granular_material,
• loose_paper,
• chain_fold,
• grassy_surface,
• grill,
• fabric,
• stomach,
• bulbous_bow,
• glass_aggregate,
• car_maintenance,
• run,
• place,
• upholstery,
• comet,
• talc,
• figure,
• dancing,
• coast_line,
• helmet,
• road_ditch,
• strip,
• film_viewing,
• network,
• ramp,
• subclinical_keratoconus,
• tiled_wall,
• garden,
• gravel,
• early_morning,
• aircraft,
• rag,
• irregular_form,
• patio_furniture,
• helicopter,
• textured_ceiling,
• eyes,
• drought,
• discretionary_bonus,
• population_census,
• stairs,
• branch,
• coil,
• nanotube,
• late_shift,
• canvas,
• land_dispute,
• chamfer,
• burn_pattern,
• hollow,
• ion_cloud,
• block_wall,
• mouth,
• magazine,
• building_product,
• rock,
• eroded_area,
• large_ear,
• person,
• heart,
• spiral_feature,
• rotation,
• demonstration_lesson,
• lampshade,
• grout_line,
• raw_log,
• statue,
• rough_surface,
• neuron,
• deck,
• fractal,
• oval_profile,
• brain,
• residual_limb,
• skin,
• brickwork,
• coastal_region,
• road_crown,
• wall_roughness,
• button,
• star_shape,
• apical_delta,
• ceiling,
• wing_joint,
• expense,
• parttime_job,
• dock_labour,
• sporting_event,
• shift,
• radius,
• brick,
• white_company,
• plywood,
• concrete_block,
• placenta,
• dentist,
• roof_vent,
• blurred_edge,
• heating,
• house_repair,
• biological_specimen,
• motor-vehicle_body,
• broccoli_head,
• mountain,
• volunteer_work,
• plural,
• cell_body,
• organized_crime,
• coupling,
• panel_line,
• wire_passage,
• tee,
• hemisphere,
• babysitting,
• mouse,
• urban_boundary,
• optional_expense,
• colorful_cossack,
• mechanical_system,
• mail_parcel,
• proximity_card,
• plastic_tubing,
• house_maintenance,
• stucco_wall,
• indian,
• finger,
• hill,
• prussian,
• cobblestone,
• web_space,
• collision,
• home_guard,
• chain_end,
• training,
• crown_molding,
• large_bolt,
• brick_fireplace,
• elbow,
• incentive_compensation,
• heart_shape,
• curve,
• registration,
• barrels,
• vellum,
• book,
• curved_moulding,
• medical_expense,
• clay,
• steps,
• lignite,
• rectangle,
• pencil_vase,
• census_eds,
• microprocessor,
• terrace,
• alteration,
• pilaster,
• lightning_bolt,
• bead_molding,
• deck_material,
• aircraft_exterior,
• sawtooth_edge,
• busbar,
• protein_structure,
• straight_line,
• auditorium_program,
• spigot_joint,
• speed_ramp,
• foam_roof,
• curved_area,
• result,
• insect,
• glass_fragment,
• huge_column,
• national_holiday,
• theft,
• stucco,
• hands,
• heel,
• ridge,
• ore,
• moulding,
• brush,
• deep_corner,
• sunday,
• road_feature,
• commission,
• fiber,
• joint,
• diamond,
• paved_area,
• traffic_accident,
• shield,
• shore_line,
• rough_slope,
• bright_line,
• effect,
• singing,
• bookshelf,
• brain_cast,
• pea,
• seizure,
• line,
• postal_mail,
• keratoconus,
• human_skeleton,
• escarpment,
• ground_surface,
• ornament,
• tile,
• windows,
• round_helmet,
• nook,
• major_shift,
• potato,
• forest_canopy,
• steady_prussian,
• major_arc,
• plaster,
• casting,
• swamp,
• volcanic_ash,
• regular_dust,
• alumina,
• vacation_expense,
• old_closure,
• rice_grain,
• parallelogram,
• crisis,
• sharp_edge,
• boulder,
• straw,
• robbery,
• building,
• ground,
• bonus,
• saturday,
• square,
• concert,
• variable_shift,
• vehicle,
• gear,
• crack,
• stair_steps,
• respiration,
• slate,
• ogee_profile,
• ink_pen,
• diaper,
• shoes,
• cable,
• thermoplastic_bottle,
• trellis,
• pharmaceutical_material,
• various_pill,
• pointed_star,
• ploughed_soil,
• wood_log,
• fresh_fruit,
• character_model,
• human_figure,
• flood,
• oval,
• curtain,
• drywall,
• turbine,
• terrorism,
• fitting,
• helmet_cell,
• carpeting,
• ellipsoid_curve,
• bark,
• service_tee,
• log,
• scene_change,
• chord,
• fence,
• indoor_light,
• door_jamb,
• mica,
• textured_wall,
• bush,
• pond,
• algerian,
• wicker,
• extreme_deviation,
• furniture,
• tidal_structure,
• loop,
• drum,
• fax,
• construction_activity,
• small_appliance,
• light_switch,
• full_moon,
• lumpy_import,
• chair,
• masonry,
• corn,
• asteroid,
• cracking,
• rubber_sheet,
• various_allowance,
• stock-option_exercise,
• asbestos,
• aikido_course,
• seam,
• large_nose,
• turbine_blade,
• peanuts,
• flange,
• holiday,
• airplane,
• traffic,
• newspaper,
• cash_payment,
• canadian_scout,
• trauma_case,
• neck_area,
• fifty_kilometer,
• cant,
• cossack,
• tomato,
• smart_card,
• coral,
• carpet,
• character_skin,
• small_satellite,
• steel_fragment,
• curved_line,
• easter,
• muddy_ground,
• deformation,
• vent,
• niche,
• sand_grain,
• lamp,
• head,
• accident,
• root-canal_ramification,
• random_coil,
• hammer,
• domain_structure,
• crook,
• curb,
• special_pipe,
• earthquake,
• motorcycle_tank,
• ship,
• holiday_bonus,
• planet,
• bottle,
• keratin_fiber,
• edge,
• alcoholism,
• syrinx,
• baseball-game_program,
• repair,
• toilet,
• tongue,
• thick_carpet,
• fire,
• tree,
• court_light,
• scalloped_edge,
• pocket,
• bulge,
• tetrapod,
• kerb,
• human_hand,
• coastline,
• rough_wood,
• crash,
• hold,
• snow,
• winding_stream,
• crime,
• wooden_stick,
• wooden_object,
• eclipse,
• car,
• pencil,
• sandy_ground,
• fitting_material,
• silica,
• miracle,
• woven_fabric,
• tubing,
• valve_body,
• hidden_words,
• archeological_specimen,
• incentive_bonus,
• close_pair,
• mountain_profile,
• trapezoid,