bulwark vs groyne

bulwark and groyne both are nouns.

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

As nouns, bulwark and groyne are synonyms defined as:

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

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

bulwark (noun)	groyne (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
an embankment built around a space for defensive purposes
a fencelike structure around a deck

bulwark (verb)	groyne (verb)
defend with a bulwark