«فَلَا بُدَّ مِنَ الْعَلَاقَةِ»
A meaningful relation between the two senses is therefore necessary.
Using “book” to mean “horse” without an intelligible conventional or rhetorical connection is not a valid trope. Mere divergence from the original sense is insufficient; the audience must have a principled route to the intended meaning.
An error lacks such a licensed connection. Kināyah is different again: the original sense is not intrinsically excluded even when a further meaning is intended. Its full analysis belongs to its later section.