Modifiers matching obstruction:

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

Simple categories matching surrounding:

• fixture,
• resource,
• structure,
• electrode,
• tissue,
• incident,
• material,
• layer,
• product,
• metal,
• area,
• heart,
• fire,
• man,
• surface,
• quantity,
• waste,
• shop,
• building,
• object,
• adjustment,
• addiction,
• paving,
• opening,
• medium,
• service,
• measure,
• land,
• sampling,
• organs,
• furniture,
• thing,
• body,
• assembly,
• cell,
• obstruction,
• field,
• employment,
• lip,
• work,
• use,
• fluid,
• death,
• group,
• nasopharynx,
• spine,
• item,
• vegetation,
• atmosphere,
• barrier,
• condition,
• sign,
• information,
• tourism,
• action,
• design,
• peak,
• gas,
• domain,
• situation,
• residence,
• rock,
• atom,
• house,
• business,
• brain,
• market,
• theme,
• happening,
• section,
• meeting,
• influence,
• lesion,
• sector,
• planting,
• ocean,
• property,
• country,
• part,
• set,
• liver,
• stomach,
• community,
• street,
• housing,
• installation,
• ion,
• mode,
• food,
• uterus,
• basin,
• growth,
• background,
• system,
• institution,
• city,
• cable,
• image,
• factory,
• school,
• device,
• event,
• entity,
• landmark,
• mixture,
• home,
• disease,
• facility,
• source,
• joint,
• injury,
• enclosure,
• monument,
• space,
• portal,
• contaminant,
• offense,
• culture,
• interaction,
• square,
• case,
• feature,
• activity,
• foam,
• component,
• muscle,
• force,
• light,
• liquid,
• clothing,
• energy,
• behavior,
• pregnancy,
• disorder,
• site,
• detector,
• earth,
• landscape,
• plagiarism,
• town,
• works,
• environment,
• equipment,
• point,
• company,
• delivery,
• unit,
• hardware,
• circumstances,
• process,
• substance,
• region,
• lake,
• vessel,
• noise,
• plate,
• organ,
• ceremony,
• control,
• water,
• artery,
• article,
• formation,
• constitution,
• location,
• air,
• viscera,
• illness,
• insulation,
• toy,