facing vs protective cover

facing and protective cover both are nouns.

Word	Noun	Adjective	Verb	Adverb
facing	Yes	No	No	No
protective cover	Yes	No	No	No

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

facing: a protective covering that protects the outside of a building
protective cover: a covering that is intend to protect from damage or injury

Other hypernyms of facing include protection, protective covering.

facing (noun)	protective cover (noun)
providing something with a surface of a different material	a covering that is intend to protect from damage or injury
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