Modifiers matching passage:

• vascular,
• hollow,
• narrow,
• related,
• closed,
• natural,
• open,
• long,
• fluid,
• thin,
• clear,
• restricted,
• small,
• instrumental,
• indoor,
• curved,
• underground,
• tubular,
• aerodynamic,
• transient,
• written,
• pedestrian,
• respiratory,
• biological,
• linear,
• internal,
• vertical,
• smaller,
• complex,
• physical,
• delicate,

Simple categories matching hollow:

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