Modifiers matching viscera:

• nearby,
• hollow,
• abdominal,
• key,
• pelvic,
• thoracic,
• normal,
• deep,
• surrounding,
• developing,
• ordinary,
• adjacent,
• fixed,
• solid,
• exposed,
• large,
• major,

Simple categories matching hollow:

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