binder vs protective cover

binder and protective cover both are nouns.

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

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

binder: holds loose papers or magazines
protective cover: a covering that is intend to protect from damage or injury

Other hypernyms of binder include protection, protective covering.

binder (noun)	protective cover (noun)
something used to tie or bind	a covering that is intend to protect from damage or injury
holds loose papers or magazines
a machine that cuts grain and binds it in sheaves
something used to bind separate particles together or facilitate adhesion to a surface