Modifiers matching boundary:

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

Simple categories matching hierarchical:

• system,
• structure,
• taxon,
• model,
• data,
• institution,
• group,
• school,
• organization,
• symmetry,
• dimension,
• tree,
• content,
• information,
• technique,
• entity,
• position,
• power,
• display,
• category,
• organisation,
• nature,
• relationship,
• subculture,
• boundary,
• opposition,
• paradigm,
• thing,
• relation,
• quality,
• directory,
• association,
• network,
• concept,
• object,
• arrangement,
• religion,
• unit,
• difference,
• grammar,
• list,
• level,
• view,
• control,
• attribute,
• job,
• means,
• feature,
• church,
• characteristic,
• database,