Hardback is a synonym of hardcover.
In of a book terms the difference between hardcover and hardback
is that hardcover is having a rigid binding while hardback is having a solid binding.
hardcover
English
Noun
(
en noun)
A book with a rigid binding, often of cardboard or leather.
Adjective
(-)
(of a book) Having a rigid binding.
Synonyms
* hardback
See also
* paperback
hardback
Noun
(
en noun)
A book with a solid binding.
Adjective
(-)
(of a book) Having a solid binding.
Synonyms
* hardcover
See also
* paperback