Modifiers matching barrier:

• solid,
• penetrating,
• multiple,
• level,
• physical,
• visual,
• artificial,
• exterior,
• architectural,
• passive,
• molecular,
• protective,
• porous,
• residential,
• removable,
• structural,
• conductive,
• moving,
• chemical,
• fixed,
• thin,
• hydraulic,
• continuous,
• impermeable,
• natural,
• static,
• larger,
• temporary,
• vertical,
• positive,
• permanent,
• confining,
• endothelial,
• mobile,
• impenetrable,
• environmental,
• hard,
• under,
• symbolic,
• concrete,
• small,
• suitable,
• significant,
• coastal,
• logical,
• high,
• up,
• durable,
• horizontal,
• rigid,
• simple,
• regulatory,
• major,
• flexible,
• typical,
• metallic,
• external,
• over,
• conventional,
• nonstructural,
• secure,
• behavioural,
• accessible,
• defined,
• resistant,
• minor,
• disposable,
• erect,
• moveable,
• reliable,
• home,
• mechanical,
• immovable,
• new,
• physiological,
• institutional,
• visible,
• nonmetallic,
• old,
• surrounding,
• animal,
• real,
• technical,
• geological,
• stable,
• effective,
• low,
• upright,
• permeable,
• light,
• outdoor,
• normal,
• opaque,
• basic,
• thick,
• linear,

Simple categories matching low:

• perennial,
• tree,
• furniture,
• shrub,
• situation,
• binder,
• area,
• process,
• object,
• chair,
• crime,
• protein,
• piece,
• surface,
• level,
• affinity,
• place,
• rank,
• country,
• building,
• plant,
• perch,
• furnishing,
• character,
• animal,
• condition,
• clearance,
• metal,
• facility,
• detail,
• grass,
• power,
• invertebrate,
• bench,
• ground,
• action,
• section,
• item,
• mood,
• value,
• establishment,
• structure,
• elevation,
• land,
• spot,
• annual,
• light,
• cloud,
• status,
• class,
• bush,
• obstruction,
• point,
• barrier,
• use,
• ornamental,
• shoes,
• vegetation,
• frequency,
• stratum,
• form,
• task,
• pressure,