revetment vs barrier

revetment and barrier both are nouns.

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

As nouns, barrier is a hypernym of revetment; that is, barrier is a word with a broader meaning than revetment:

revetment (noun)	barrier (noun)
a facing (usually masonry) that supports an embankment	a structure or object that impedes free movement
a barrier against explosives	any condition that makes it difficult to make progress or to achieve an objective
	anything serving to maintain separation by obstructing vision or access