When I was a small kid, floppy disks were actually floppy (5.25") and contained actual spinning disks, floppy disk drives contained the thing that drove the disks (i.e. the motor), and hard disk drives had hard disks (metal platters) and the thing that drove them all in one package. Fair enough.
Not long after, we got 3.5" floppies that had a hard plastic shell and were not actually floppy anymore. Still called them floppies.