Folio and Softback

Folio noun - A book (or manuscript) consisting of large sheets of paper folded in the middle to make two leaves or four pages.

Softback and folio are semantically related. In some cases you can use "Softback" instead a noun "Folio".

Softback noun - A book with paper covers.

Folio and softback are semantically related. Sometimes you can use "Folio" instead a noun "Softback".