groyne vs seawall

groyne and seawall both are nouns.

Word	Noun	Adjective	Verb	Adverb
groyne	Yes	No	No	No
seawall	Yes	No	No	No

As nouns, groyne and seawall are synonyms defined as:

groyne and seawall: a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away

Other synonyms of groyne include breakwater, bulwark, groin, jetty, mole.

groyne (noun)	seawall (noun)
a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away	a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away