revetment vs facing

revetment and facing both are nouns.

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

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

Other hypernyms of revetment include cladding.

revetment (noun)	facing (noun)
a facing (usually masonry) that supports an embankment	providing something with a surface of a different material
a barrier against explosives	a protective covering that protects the outside of a building
	a lining applied to the edge of a garment for ornamentation or strengthening
	an ornamental coating to a building