Modifiers matching boundary:

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

Simple categories matching spherical:

• seed,
• body,
• moon,
• object,
• powder,
• surface,
• colloid,
• abrasive,
• macromolecule,
• article,
• group,
• aggregate,
• entity,
• thing,
• particle,
• shape,
• part,
• screen,
• boundary,
• protein,
• missile,
• container,
• structure,
• figure,
• bead,
• lense,
• fruit,
• cell,
• location,
• polymer,
• filler,
• medium,
• item,
• molecule,
• ball,
• material,
• planet,
• inclusion,
• rock,
• solute,
• substance,
• knob,
• kernel,