groyne vs jetty

groyne and jetty both are nouns.

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

As nouns, groyne and jetty are synonyms defined as:

groyne and jetty: 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, mole, seawall.

groyne (noun)	jetty (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