Modifiers matching obstruction:

• physical,
• geographic,
• permanent,
• over,
• under,
• vertical,
• featureless,
• upright,
• nasal,
• mechanical,
• temporary,
• underwater,
• solid,
• opaque,
• external,
• nearby,
• hard,
• impenetrable,
• clear,
• elongated,
• overhead,
• electrical,
• terrestrial,
• current,
• indoor,
• surrounding,
• topical,
• taller,
• virtual,
• outdoor,
• underground,
• layer,
• artificial,
• visual,
• urethral,
• isolated,
• adjacent,
• relevant,
• large,
• bigger,
• multiple,
• hazardous,
• low,
• fixed,
• internal,
• smaller,
• larger,
• past,
• short,
• rigid,
• major,
• horizontal,
• removable,
• level,
• spatial,
• subsurface,
• natural,
• visible,
• hydraulic,
• metal,
• movable,
• up,
• tall,
• environmental,
• dense,
• discrete,
• raised,
• small,
• insurmountable,
• significant,
• common,
• additional,
• cooler,
• hidden,
• lateral,
• lighted,
• irregular,
• immovable,
• typical,
• simple,
• linear,
• structural,
• unusual,
• minor,
• local,

Simple categories matching artificial:

• construction,
• material,
• waterway,
• gem,
• structure,
• fiber,
• decoration,
• tree,
• thermostat,
• container,
• surface,
• entity,
• glass,
• pond,
• measure,
• defence,
• object,
• arm,
• flavouring,
• fibre,
• substance,
• network,
• sweetener,
• cloning,
• system,
• grass,
• tube,
• institution,
• obstruction,
• stone,
• light,
• grouping,
• sensor,
• wetland,
• graphite,
• land,
• item,
• reef,
• flavor,
• sense,
• enclosure,
• additive,
• wealth,
• artefact,
• cue,
• plant,
• marker,
• pathogen,
• siding,
• flower,
• perturbation,
• constraint,
• substrate,
• floor,
• disturbance,
• enterprise,
• marking,
• filament,
• compound,
• product,
• fluid,
• muscle,
• contraceptive,
• domain,
• piece,
• rock,
• bone,
• preparation,
• component,
• ingredient,
• conveyance,
• weight,
• environment,
• character,
• lubricant,
• gemstone,
• feeding,
• polymer,
• equipment,
• layer,
• casing,
• conduit,
• satellite,
• flavoring,
• creation,
• practice,
• drainage,
• shade,
• noisemaker,
• polyester,
• particle,
• action,
• goal,
• habitat,
• sound,
• event,
• fuel,
• part,
• space,
• flavour,
• distortion,
• scent,
• bait,
• polyamide,
• feed,
• sapphire,
• obstacle,
• order,
• activity,
• extremity,
• actuation,
• stimulus,
• binder,
• agent,
• stimulant,
• gas,
• emulsion,
• machine,
• image,
• treatment,
• care,
• highway,
• control,
• noise,
• appliance,
• fragrance,
• selection,
• device,
• creature,
• progestin,
• organs,
• limb,
• defect,
• clothing,
• lake,
• silk,
• jewellery,
• relic,
• deposit,
• vegetation,
• flaw,
• preservative,
• humanoid,
• method,
• devices,
• hormone,
• production,
• situation,
• channel,
• resin,
• jewel,
• means,
• perch,
• lighting,
• dielectric,
• sign,
• sediment,
• body,
• organ,
• condition,
• tissue,
• medium,
• article,
• works,
• facility,
• unit,
• attribute,
• nail,
• cavity,
• hazard,
• intoxicant,
• vesicle,
• illuminant,
• crystal,
• thing,
• panel,
• location,
• illumination,
• activator,
• source,
• process,
• forest,
• language,
• watercourse,
• person,
• chemical,
• shelter,
• oil,
• lure,
• cause,
• barrier,
• phenomenon,
• area,
• food,
• leather,
• ground,
• fabric,
• aid,
• cosmetic,
• odour,
• blockage,
• housing,
• abrasive,
• harbor,
• receptacle,
• drain,
• fastener,
• fill,
• rod,
• intelligence,
• support,
• effort,
• instrument,
• aggregate,
• textile,
• feature,
• joint,
• boundary,