Hardback and Quarto

Hardback noun - A book with cardboard or cloth or leather covers.

Quarto and hardback are semantically related. In some cases you can use "Quarto" instead a noun "Hardback".

Quarto noun - The size of a book whose pages are made by folding a sheet of paper twice to form four leaves.

Hardback and quarto are semantically related. Sometimes you can use "Hardback" instead a noun "Quarto".