lining vs protective cover

lining and protective cover both are nouns.

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

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

lining: a protective covering that protects an inside surface
protective cover: a covering that is intend to protect from damage or injury

Other hypernyms of lining include protection, protective covering.

lining (noun)	protective cover (noun)
the act of attaching an inside lining (to a garment or curtain etc.)	a covering that is intend to protect from damage or injury
providing something with a surface of a different material
a protective covering that protects an inside surface
a piece of cloth that is used as the inside surface of a garment