Modifiers matching obstruction:

• permanent,
• smaller,
• natural,
• removable,
• physical,
• solid,
• upright,
• temporary,
• large,
• external,
• vertical,
• level,
• lateral,
• taller,
• impenetrable,
• unusual,
• clear,
• small,
• short,
• visual,
• visible,
• virtual,
• insurmountable,
• structural,
• hidden,
• tall,
• overhead,
• subsurface,
• additional,
• nearby,
• discrete,
• artificial,
• multiple,
• current,
• surrounding,
• layer,
• larger,
• movable,
• hard,
• fixed,
• linear,
• electrical,
• adjacent,
• internal,
• terrestrial,
• cooler,
• indoor,
• environmental,
• lighted,
• minor,
• spatial,
• major,
• hazardous,
• underground,
• elongated,
• horizontal,
• urethral,
• immovable,
• raised,
• common,
• bigger,
• low,
• featureless,
• outdoor,
• opaque,
• underwater,
• hydraulic,
• metal,
• irregular,
• dense,
• up,
• geographic,
• topical,
• simple,
• nasal,
• past,
• typical,
• isolated,
• relevant,
• under,
• over,
• local,
• significant,
• mechanical,
• rigid,

Simple categories matching terrestrial:

• mammal,
• biome,
• animal,
• location,
• matter,
• planet,
• ectotherm,
• vegetable,
• life,
• grass,
• plain,
• invertebrate,
• power,
• predator,
• arthropod,
• organism,
• habitat,
• host,
• connection,
• network,
• meat,
• insect,
• attribute,
• felid,
• amphibian,
• product,
• pattern,
• salamander,
• arachnid,
• group,
• fauna,
• vertebrate,
• scavenger,
• plant,
• surface,
• snake,
• ecosystem,
• anthropoid,
• isopod,
• structure,
• obstruction,
• mollusk,
• system,
• herbivore,
• zoology,
• ecology,
• item,
• disturbance,
• force,
• study,
• means,
• rodent,
• green,
• omnivore,
• beast,
• vegetation,
• species,
• science,
• feature,
• carnivore,
• component,
• change,
• deposit,
• bird,
• livestock,
• market,
• mollusc,
• taxon,
• flora,
• area,
• ungulate,
• game,
• event,
• marsupial,
• crustacean,
• gecko,
• adaptation,
• program,
• site,
• snail,
• gastropod,
• prey,
• being,
• phenomenon,
• vehicle,
• information,
• monkey,
• critter,
• insectivore,
• rock,
• evidence,
• pathology,
• poultry,
• creature,
• object,
• reptile,
• lizard,
• tetrapod,
• tree,
• body,
• quality,
• substrate,
• pest,
• microorganism,
• material,
• option,
• dweller,
• source,
• order,
• anuran,
• beetle,
• user,