Positions in my facility are like this: CNA's fill these spots: Patient Care Tech, Scheduler, Unit Secretary, Activity assistant, Restorative Nurse Aide. LPN's fill (or can fill) these spots: Supervisor, Charge Nurse, Staff Nurse, Treatment Nurse, Unit Manager, MDS Assistant, Admissions Nurse. RN's ONLY fill these positions: DON, ADON, MDS Coordinator, RN Supervisors.
Positions follow scope, however we take experience into account.
The supervisors generally coordinate care on the floor during the evenings/nights/weekends. They assist with admissions, labs, reporting, and handling family concerns. Different facilities do it different ways, though, so you have to be careful.