estuary (n.)

• arm
• armlet
• avenue
• bay
• bayou
• belt
• bight
• blowhole
• channel
• chute
• cove
• creek
• door
• egress
• escape
• exhaust
• exit
• fjord
• floodgate
• flume
• frith
• gulf
• gut
• harbor
• inlet
• loch
• loophole
• mouth
• narrow
• narrows
• opening
• out
• outcome
• outfall
• outgo
• outlet
• pore
• port
• reach
• road
• roads
• roadstead
• sluice
• sound
• spiracle
• spout
• strait
• straits
• tap
• vent
• venthole
• vomitory
• weir