Modifiers matching ball:

• smaller,
• large,
• metal,
• oversized,
• hard,
• light,
• formal,
• round,
• spherical,
• heavy,
• sized,
• athletic,
• size,
• soft,
• solid,
• big,
• small,
• hollow,
• smooth,
• larger,
• sporting,
• professional,
• moving,
• heavier,
• inflatable,
• supporting,
• typical,
• lightweight,

Simple categories matching hollow:

• object,
• ceiling,
• fiber,
• fibre,
• article,
• handgrip,
• component,
• stem,
• assembly,
• structure,
• item,
• shaft,
• part,
• protuberance,
• dish,
• plant,
• vessel,
• organ,
• space,
• pole,
• form,
• glassware,
• utensil,
• implement,
• shell,
• container,
• receptacle,
• passage,
• product,
• carrier,
• tube,
• ware,
• cylinder,
• pipe,
• wood,
• wall,
• organs,
• material,
• piece,
• polyhedron,
• bird,
• region,
• tissue,
• thing,
• body,
• surface,
• ball,
• construction,
• formation,
• panel,
• animal,
• area,
• cavity,
• section,
• bone,
• sphere,
• particle,
• conduit,
• bones,
• viscus,
• instrument,
• viscera,
• tubing,
• jewelry,
• needle,
• glass,
• reed,
• feature,
• tree,
• beads,
• shape,