Modifiers matching arena:

• complex,
• gymnastic,
• larger,
• large,
• public,
• visible,
• commercial,
• indoor,
• domestic,
• smaller,
• grand,
• busy,
• conventional,
• vertical,
• social,
• private,
• national,
• technological,
• strategic,
• big,
• accessible,
• sacred,
• unique,
• political,
• key,
• traditional,
• cultural,
• educational,
• diverse,
• technical,
• modern,
• huge,
• mechanical,
• outside,
• global,
• societal,
• appropriate,
• biomedical,
• professional,
• major,
• conceptual,
• sporting,
• scientific,
• legal,
• typical,
• official,
• outdoor,
• academic,

Simple categories matching indoor:

• floor,
• site,
• activity,
• sport,
• furniture,
• job,
• vehicle,
• game,
• pesticide,
• area,
• fixture,
• unit,
• facility,
• wall,
• fitting,
• task,
• toy,
• object,
• event,
• container,
• problem,
• location,
• housing,
• surface,
• device,
• space,
• firework,
• pool,
• recreation,
• chemical,
• stuff,
• allergen,
• renovation,
• source,
• building,
• medium,
• coating,
• food,
• gas,
• housework,
• obstruction,
• application,
• control,
• entertainment,
• attraction,
• treatment,
• theatre,
• athletics,
• air,
• tile,
• allergy,
• pollutant,
• fun,
• function,
• equipment,
• contaminant,
• enclosure,
• communication,
• thing,
• drain,
• scene,
• setting,
• ornament,
• shot,
• appliance,
• decoration,
• atmosphere,
• assembly,
• sound,
• usage,
• project,
• centre,
• plant,
• place,
• fuel,
• particle,
• clientele,
• fountain,
• room,
• meeting,
• antigen,
• structure,
• exhibit,
• arena,
• passage,
• pest,
• photograph,
• pet,
• item,
• particulate,
• restaurant,
• organism,
• substrate,
• display,
• climate,
• partition,
• insect,
• product,
• performance,
• establishment,
• art,
• graphics,
• animal,
• condition,
• antenna,
• component,
• substance,
• dog,
• celebration,
• bird,
• creature,
• noise,
• work,
• exercise,
• material,
• play,
• devices,
• quality,
• furnishing,
• use,
• lamp,
• gathering,
• lighting,
• environment,
• covering,
• machine,
• stadium,
• institution,
• diversion,
• party,
• loudspeaker,
• houseplant,
• light,
• installation,
• venue,
• lodging,
• support,
• exposure,
• course,
• flower,
• action,
• shelter,
• set,