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wave 
Undulation caused by the wind on the surface of a sea or lake.
wave base
Maximum depth beneath which wave action is no longer perceptible.
still water level
Level of the water surface in the absence of waves.
trough
Lowest point of the wave.
sand bar
Accumulation of sediment at the bottom of the sea, close to the shoreline; it is sometimes exposed at low tide.
foam
Whitish froth that forms on the water surface when a wave breaks.
shore
Strip of land where the sea meets the land.
breaker
High wave that breaks on the coast.
wave length
Horizontal distance between two successive crests or troughs.
crest
The highest point of a wave.
wave height
Vertical distance between the crest and the trough.
