Modifiers matching obstacle:

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

Simple categories matching working:

• laser,
• project,
• fluid,
• disc,
• surface,
• means,
• home,
• use,
• job,
• gear,
• part,
• manual,
• tool,
• condition,
• task,
• control,
• animal,
• key,
• medium,
• instrument,
• head,
• gas,
• horse,
• standard,
• equipment,
• dog,
• connection,
• drawing,
• sector,
• wood,
• day,
• thing,
• implement,
• unit,
• elements,
• time,
• operation,
• item,
• substance,
• garden,
• accident,
• people,
• banquet,
• tissue,
• memory,
• file,
• meeting,
• employee,
• pattern,
• quality,
• folder,
• knowledge,
• discipline,
• body,
• order,
• movement,
• garment,
• glass,
• car,
• times,
• oil,
• method,
• woman,
• relationship,
• assets,
• activity,
• sheepdog,
• feature,
• chamber,
• facility,
• vehicle,
• line,
• system,
• engineer,
• component,
• hardware,
• structure,
• model,
• place,
• user,
• form,
• individual,
• piece,
• procedure,
• material,
• machinery,
• device,
• vessel,
• location,
• toy,
• appliance,
• ground,
• ship,
• variable,
• solution,
• event,
• document,
• charge,
• force,
• papers,
• buffer,
• fixture,
• organs,
• land,
• industry,
• agreement,
• building,
• uniform,
• craft,
• clothing,
• clothes,
• section,
• practice,
• situation,
• map,
• level,
• information,
• hours,
• environment,
• arrangement,
• organisation,
• vapor,
• machine,
• party,
• days,
• database,
• transporter,
• fan,
• family,
• livestock,
• committee,
• lunch,
• law,
• characteristic,
• object,
• paraphernalia,
• electrode,
• skill,
• status,
• register,
• area,
• metal,
• attribute,
• liquid,
• mixture,
• atmosphere,
• depth,
• apparel,
• space,
• capital,
• face,
• set,
• glove,
• collection,
• professional,
• culture,
• room,
• group,
• mechanism,
• conveyor,
• life,
• class,
• end,
• platform,
• process,
• solvent,
• expense,
• boat,
• cable,
• obstacle,
• property,
• table,
• performance,