barrier Synonyms

roadblock deterrent fence boundary dam railing impediment hindrance gate obstruction constraint restriction blockade partition difficulty obstacle embankment bar palisade wall stopper screen stockade tariff scarp stile tenaille stoccado revetment sea wall separation shielding shield snag septum septulum stricture spane stumbling-block separator retardment preclusive portcullis patency paries parapet parados paneling restrainer paling