Both a SCADA and a GOT are HMIs.

SCADA (Supervisory Control and Data Acquisition) is a piece of automation software being installed on an existing PC with an OS (Operating System). This software, in most cases, is commercial (licensed).
GOT (Graphic Operation Terminal) (aka Terminal) is a piece of automation hardware, containing a predetermined OS. This HMI is being configured via engineering software installed on an external PC (Personal Computer).