groin (n.)
- abutment
- anchorage
- arc-boutant
- backstop
- bank
- bar
- barrage
- barrier
- basin
- beam
- berth
- boom
- branch
- breakwater
- breastwork
- buffer
- bulkhead
- bulwark
- buttress
- buttressing
- cofferdam
- crotch
- crutch
- dam
- defense
- delta
- dike
- ditch
- dock
- dockage
- dockyard
- earthwork
- embankment
- fan
- fence
- fork
- furcula
- gate
- harbor
- harborage
- haven
- inguen
- jam
- jetty
- landing
- levee
- logjam
- marina
- milldam
- moat
- mole
- mound
- offshoot
- parapet
- pier
- port
- portcullis
- prong
- quay
- ramification
- rampart
- road
- roadblock
- roads
- roadstead
- seaport
- seawall
- shipyard
- shoulder
- slip
- stem
- trident
- wall
- weir
- wharf
- wishbone
- work
