Modifiers matching polyhedron:

• convex,
• simple,
• basic,
• useful,
• regular,
• hollow,
• symmetric,
• complicated,

Simple categories matching convex:

• region,
• shape,
• side,
• slope,
• object,
• set,
• polyhedron,
• position,
• polygon,
• structure,
• surface,
• part,
• figure,
• area,
• space,
• lens,
• body,