The difference between Groyne and Seawall
When used as nouns, groyne means an often wooden structure that projects from a coastline to prevent erosion, longshore drift etc, whereas seawall means a coastal defence in the form of a wall or an embankment.
check bellow for the other definitions of Groyne and Seawall
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Groyne as a noun:
An often wooden structure that projects from a coastline to prevent erosion, longshore drift etc.; a breakwater.
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Seawall as a noun:
A coastal defence in the form of a wall or an embankment.