book jacket vs dust cover

book jacket and dust cover both are nouns.

Word	Noun	Adjective	Verb	Adverb
book jacket	Yes	No	No	No
dust cover	Yes	No	No	No

As nouns, book jacket and dust cover are synonyms defined as:

book jacket and dust cover: a paper jacket for a book; a jacket on which promotional information is usually printed

Other synonyms of book jacket include dust jacket, dust wrapper.

book jacket (noun)	dust cover (noun)
a paper jacket for a book; a jacket on which promotional information is usually printed	a removable plastic protective covering for a piece of equipment
	a large piece of cloth used to cover furniture that is not in use for a long period
	a paper jacket for a book; a jacket on which promotional information is usually printed