What is the difference between an ion-induced dipole attraction and just an ion-dipole attraction?
It is useful to note the definition of a van der Waal force: weak electric forces attracting neutral molecules to each other in gas thus causing a gas to deviate from an ideal gas.

So, there are three types of these forces


Dipole-dipole force
Dipole-induced dipole force
London dispersion force


It becomes clear that forces involving ions do not fit van de Waals forces as the molecules involved must be neutral. 

An ion-induced dipole force is not a dispersion force, either (as dispersion forces are a subset of van der Waals), and with ion-dipole forces, ion-induced dipole forces have a category of it's own

A dipole-induced dipole force is a van der Waal force but not a dispersion force