A manager is somebody who has a level of control and responsibility in a company or organization. For example, in a small clothing store, the salespeople would be responsible for selling and helping customers… and the manager would be responsible for making the salespeople’s schedule, organizing the store’s finances, training new salespeople, and resolving any problems among the employees.
The word boss simply refers to the person above you in the company hierarchy. Let’s say we have a company with:
If you are the employee, then the manager is your boss. If you are the director, then the vice-president is your boss.
Your boss is the person supervising you, who may be responsible for evaluating your work or giving approval for certain decisions.
An administrator is simply a person who does administrative work (working with documents, paperwork, information and data, etc.) An administrator can also be a manager or boss if he or she is the leader of a team of employees… or an administrator can simply be a regular employee.