Modifiers matching boundary:

• natural,
• single,
• oceanic,
• physical,
• hydraulic,
• hexagonal,
• solid,
• permanent,
• geopolitical,
• smaller,
• significant,
• visual,
• fixed,
• atmospheric,
• ecological,
• sharp,
• complex,
• internal,
• nonconducting,
• semitransparent,
• outer,
• geographical,
• logical,
• distinct,
• governing,
• historical,
• vertical,
• moving,
• geological,
• irregular,
• hierarchical,
• spatial,
• syntactic,
• horizontal,
• political,
• cultural,
• jurisdictional,
• hard,
• spherical,
• biological,
• artificial,
• external,
• smooth,
• convenient,
• administrative,
• legal,
• critical,
• nearby,
• front,
• simple,
• curved,
• crystalline,
• real,
• rigid,
• static,
• structural,
• clear,

Simple categories matching outer:

• disturbance,
• article,
• extremity,
• garment,
• clothing,
• shell,
• power,
• skin,
• integument,
• part,
• body,
• clothes,
• piece,
• stressor,
• layer,
• face,
• structure,
• package,
• world,
• sense,
• change,
• surface,
• force,
• packaging,
• appendage,
• danger,
• characteristic,
• attribute,
• container,
• item,
• fabric,
• object,
• elements,
• circle,
• footwear,
• block,
• box,
• gear,
• muscle,
• accoutrement,
• system,
• atmosphere,
• mirror,
• organ,
• appearance,
• tissue,
• case,
• area,
• space,
• condition,
• cloth,
• opening,
• coating,
• control,
• cap,
• wall,
• coat,
• covering,
• equipment,
• shape,
• boundary,
• position,
• jacket,
• material,
• ware,