I mean... My computer has a device called RAM that communicates with the north bridge by a protocol where sequential readings have lower latency than random ones. It also has a device called disk (or sometimes drive), that has nothing shaped like a disk (and is never loaded), and communicates with the north bridge by a protocol where sequential readings have lower latency than random ones.
At the CPU side, there is an in-package device that communicates with the memory controller by a protocol where sequential readings have lower latency than random ones. It communicates with an in-die device, that finally communicates with the CPU with a protocol that provides random access. That last one is obviously not called "RAM".
Nope. A pagefile is random-access memory backed by your sequential-access hard drive (or, hey, maybe your random-access SSD) instead of your "RAM".