roof vs protective cover

roof and protective cover both are nouns.

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

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

roof: a protective covering that covers or forms the top of a building
protective cover: a covering that is intend to protect from damage or injury

Other hypernyms of roof include protection, protective covering.

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

roof: protective covering on top of a motor vehicle
protective cover: a covering that is intend to protect from damage or injury

Other hypernyms of roof include protection, protective covering.

roof (noun)	protective cover (noun)
a protective covering that covers or forms the top of a building	a covering that is intend to protect from damage or injury
protective covering on top of a motor vehicle
an upper limit on what is allowed
the inner top surface of a covered area or hollow space

roof (verb)	protective cover (verb)
provide a building with a roof; cover a building with a roof