As nouns the difference between hardpack and hardback
is that hardpack is dirt or gravel compressed into a hard, smooth surface for roads etc while hardback is a book with a solid binding.
As an adjective hardback is
(of a book) having a solid binding.
hardpack
English
Noun
(-)
dirt or gravel compressed into a hard, smooth surface for roads etc. hardback
Noun
(
en noun)
A book with a solid binding.
Adjective
(-)
(of a book) Having a solid binding.
Synonyms
* hardcover
See also
* paperback