Modifiers matching obstacle:

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

Simple categories matching working:

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