pocket edition vs softback

pocket edition and softback both are nouns.

Word	Noun	Adjective	Verb	Adverb
pocket edition	Yes	No	No	No
softback	Yes	No	No	No

As nouns, softback is a hypernym of pocket edition; that is, softback is a word with a broader meaning than pocket edition:

Other hypernyms of pocket edition include paper-back book, paperback, paperback book, soft-cover, soft-cover book, softback book.

pocket edition (noun)	softback (noun)
pocket-sized paperback book	a book with paper covers