Modifiers matching cavity:

• negative,
• artificial,
• thin,
• natural,
• underground,
• hollow,
• small,
• major,
• internal,
• deep,
• moist,
• accessible,
• tubular,
• simple,
• secretory,
• thoracic,
• over,
• peripheral,
• inner,
• pelvic,
• closed,
• dead,
• neighboring,
• uterine,
• cardiac,
• micro,
• intermediate,
• available,
• interior,
• large,
• complex,
• nearby,
• anatomical,
• subsurface,
• dark,
• vascular,
• organic,
• abdominal,
• adjacent,
• sensitive,
• mucosal,

Simple categories matching hollow:

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