bulwark Synonyms

breakwater seawall jetty rampart mole groin groyne wall redan screen scarp portcullis presidio protection protector safeguard revetment redoubt ravelin paries parapet parados levee linchpin machicolation mainstay mantelet merlon moat counterspy mound murage outpost outwork palisade palladium sea wall shield stoccado lightning conductor lightning rod break water busman Rock of Gibraltar gram molecule mol overprotection mudguard entrenchment patroller