breakwater vs seawall

breakwater and seawall both are nouns.

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

As nouns, breakwater and seawall are synonyms defined as:

breakwater 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 breakwater include bulwark, groin, groyne, jetty, mole.

breakwater (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