Administrators are ones who direct others in the pursuit of ends by the use of means, both of which have been specified by a third party. For example, one who supervises a group of clerks who perform a routine task such as order entry of preparation of purchase orders is normally an administrator. What his or her subordinates do has been specified by an authority higher than their immediate boss, the supervisor. In general, supervisors are administrators. Government is full of administrators because the bureaucracy of which they are part usually specifies the ends and means to be employed by those who must do the actual work.
A manager is one who directs others in the pursuit of ends by the use of means that the manager selects. Many who are called managers, even in the private sector, are really administrators. The more autocratic an organization, the fewer managers and more administrators. The more democratic an organization, the more managers and fewer administrators.
A leader is one who directs others in the pursuit of ends by the use of means that those he leads select, in the sense that those who follow a leader do so voluntarily.
