(n.) The land bordering on, or adjacent to, the sea; the seashore. Also used adjectively.

bank beach berm coast coastal coastland coastline embankment foreshore ironbound coast lido littoral plage playa riparial riparian riparious riverside riviera rockbound coast sands sea margin seabank seabeach seaboard seacliff seacoast seashore shingle shore shoreline shoreside shoreward strand submerged coast tidewater waterfront waterside