Aside from talkdown, there are 3 radar positions (UK mil); Director, Approach & Zone.
Director talks the a/c around the radar pattern (inbounds & trg)
Approach is departures, & inbounds until h/o to director.
Zone is transits.
Dir & App tasks may be combined
App & Zone may be combined
Dir & App & Zone may be combined
The wrong suffix to the callsign doesn't normally upset anyone unless you use "tower", "radio" or info"
ap