Modifiers matching obstacle:

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

Simple categories matching removable:

• item,
• appliance,
• crank,
• part,
• sediment,
• bolt,
• equipment,
• means,
• thing,
• medium,
• container,
• carrier,
• module,
• clothing,
• fixing,
• material,
• connection,
• location,
• tank,
• surface,
• filter,
• token,
• contaminant,
• liner,
• piece,
• hardware,
• content,
• object,
• structure,
• device,
• gear,
• cover,
• computer,
• extra,
• adapter,
• upright,
• appurtenance,
• fitting,
• component,
• card,
• obstacle,
• drive,
• obstruction,
• substance,
• article,
• weight,
• feature,
• barrier,
• ballast,
• fastener,