Modifiers matching barrier:

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

Simple categories matching regulatory:

• body,
• element,
• agency,
• organization,
• response,
• information,
• goal,
• process,
• factor,
• measure,
• guidance,
• institution,
• authorities,
• restriction,
• protein,
• structure,
• molecule,
• force,
• quango,
• motif,
• substance,
• activity,
• initiative,
• fee,
• condition,
• document,
• entity,
• option,
• enforcement,
• sanction,
• mechanism,
• investigation,
• audit,
• report,
• procedure,
• advocate,
• organisation,
• kinase,
• unit,
• topic,
• jurisdiction,
• mandate,
• phenomenon,
• work,
• requirement,
• cell,
• issue,
• organs,
• content,
• property,
• framework,
• team,
• arrangement,
• component,
• standard,
• penalty,
• approval,
• hormone,
• enzyme,
• gene,
• rule,
• action,
• program,
• official,
• nature,
• control,
• system,
• matter,
• panel,
• training,
• task,
• instrument,
• concept,
• rna,
• statute,
• substrate,
• group,
• function,
• development,
• state,
• material,
• barrier,
• review,
• law,
• tissue,
• constraint,
• cytokine,
• commission,
• service,
• domain,
• compliance,
• change,
• tradition,
• practice,
• effort,
• laws,
• authority,
• event,
• submission,
• area,
• committee,
• level,
• right,