“Is “Glideslope” different from ILS?”
Glidelope is one component of an ILS system. It provides the vertical positioning. There is also a horizontal component that guides the plane to the threshold laterally. That component usually comes from a Terminal VOR.
No, the lateral guidance for an ILS comes from a LOC, or localizer.
A LOC only provides guidance for 10 degrees either side of the runway centerline, while a VOR can provide guidance for the full 360 degrees around it.