half binding vs book binding

half binding and book binding both are nouns.

Word	Noun	Adjective	Verb	Adverb
half binding	Yes	No	No	No
book binding	Yes	No	No	No

As nouns, book binding is a hypernym of half binding; that is, book binding is a word with a broader meaning than half binding:

half binding: book binding in which the spine and part of the sides are bound in one material and the rest in another
book binding: the protective covering on the front, back, and spine of a book

Other hypernyms of half binding include back, binding, cover.

half binding (noun)	book binding (noun)
book binding in which the spine and part of the sides are bound in one material and the rest in another	the protective covering on the front, back, and spine of a book