barrier vs balustrade

barrier and balustrade both are nouns.

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

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

barrier: a structure or object that impedes free movement
balustrade: a railing at the side of a staircase or balcony to prevent people from falling

barrier (noun)	balustrade (noun)
a structure or object that impedes free movement	a railing at the side of a staircase or balcony to prevent people from falling
any condition that makes it difficult to make progress or to achieve an objective
anything serving to maintain separation by obstructing vision or access