Modifiers matching obstacle:

• single,
• geographic,
• impenetrable,
• natural,
• physical,
• elevated,
• opaque,
• high,
• artificial,
• wooden,
• visual,
• fixed,
• clear,
• thick,
• rural,
• linear,
• private,
• overhead,
• large,
• static,
• hazardous,
• dangerous,
• typical,
• underground,
• common,
• small,
• distant,
• stationary,
• concrete,
• world,
• solid,
• geological,
• environmental,
• nearby,
• psychological,
• institutional,
• everyday,
• simple,
• coming,
• moving,
• unusual,
• extensive,
• special,
• structural,
• dense,
• soft,
• penetrating,
• external,
• multiple,
• unmovable,
• dynamic,
• permanent,
• rigid,
• passive,
• advanced,
• interfering,
• outdoor,
• tricky,
• local,
• practical,
• adjacent,
• narrow,
• difficult,
• over,
• size,
• mechanical,
• architectural,
• porous,
• additional,
• creative,
• working,
• rectangular,
• movable,
• tall,
• vertical,
• urban,
• removable,

Simple categories matching stationary:

• terminal,
• phone,
• opacity,
• object,
• equipment,
• machine,
• item,
• bicycle,
• substance,
• node,
• place,
• sound,
• surface,
• original,
• structure,
• furnace,
• marker,
• support,
• point,
• screen,
• location,
• obstacle,
• camera,
• art,
• application,
• platen,
• system,
• tissue,
• target,
• activity,
• unit,
• source,
• part,
• plant,
• edge,
• article,
• transmitter,
• thing,
• noisemaker,
• appliance,
• shower,
• building,
• liquid,
• fluid,
• peripheral,
• process,
• work,
• animal,
• sensor,
• area,
• store,
• content,
• organs,
• conductor,
• noise,
• engine,
• task,
• device,
• infrastructure,
• trainer,
• site,
• mold,
• organism,
• base,
• computer,
• motor,
• fixture,
• tool,
• requirement,
• transformation,
• product,
• container,
• platform,
• exerciser,
• feature,
• environment,
• business,
• apparatus,
• installation,
• use,
• shock,
• material,
• component,
• facility,
• exercise,
• image,
• machinery,
• request,
• phenomenon,
• entity,
• tumor,
• bike,
• establishment,
• medium,
• member,
• magnet,
• construction,
• airfoil,
• position,
• pattern,
• signal,
• server,
• body,
• furniture,
• weapon,
• vehicle,
• display,
• works,