barrier vs jetty

barrier and jetty both are nouns.

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

As nouns, jetty is a hyponym of barrier; that is, jetty is a word with a more specific, narrower meaning than barrier:

barrier: a structure or object that impedes free movement
jetty: a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away

barrier (noun)	jetty (noun)
a structure or object that impedes free movement	a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away
any condition that makes it difficult to make progress or to achieve an objective
anything serving to maintain separation by obstructing vision or access