barrier Synonyms

roadblock tourniquet scarp revetment retardment restriction preventive restraint restrainer remora redoubt sea wall separator septulum tollbooth tenaille stumbling-block stricture stockade stoccado stile spane snag septum redan ravelin rampart paling padlock outwork occlusion obstruction obstipation obstacle murage moat merlon palisade parados railing rail quickset problem preventative preclusive portcullis patency partition parapet mantelet