palisade

noun palisade

• backstop — a screen or fence to prevent balls leaving the playing area
• barrier — A barrier is something such as a rule, law, or policy that makes it difficult or impossible for something to happen or be achieved.
• bastille — a fortress in Paris, built in the 14th century: a prison until its destruction in 1789, at the beginning of the French Revolution
• blank wall — an impassable barricade or obstacle; a situation in which further progress is impossible: Attempts to get information by questioning the neighbors ran into a blank wall.
• butte — an isolated steep-sided flat-topped hill