What is the difference in positions: Secretary, PA, EA and Office Manager?

Executive Assistant is a person who collaborates with the Executive Chairman in keynotes, taking dictation, paperwork, and bookkeeping. Anything paperwork is the key with the Executive Assistant. They get paid more for doing all the mind work.

PA- person who makes life easier for their bosses by organizing their time table, scheduling their appointments, managing their files, and booking or cancelling their appointments to let their bosses work stress free and at their productive best. They get paid less.

The primary job responsibility of an office manager is to coordinate office support services, including purchasing and facilities management.

A secretary is a person who provides clerical and administrative support. Secretaries may perform tasks such as typing and filing, answering the phone and making appointments for her supervisor.

Answer:

EXECUTIVE : one who has the executing power among others

Differentiate between:

             Director and Executive Director

            Director has the power, but the Executive Director has the final executing authority!

similarly; 

  Assistant and Executive Assistant

Personal Assistant  or simply ASSISTANT  is a common word for the one who assists (Everything from lighting cigarette to arrange movie tickets for boss) the CXO's ( Chairman, CEO, CFO etc) -  but the Executive Assistant ( EA) is the one who has decision making ability to handle the CXO's Office for running the office. Assisting the boss in his domain, whether sales, operation, etc; no limitation. Another nomenclature is Executive Aide – (also EA)

Similarly,

Personal Secretary or simply Secretary is a common word for the one who does secretarial work like drafting, business correspondence, organizing meeting and minutes, database of filing, retrieving of originals, itinerary management, public relation management, total productive maintenance of the appliances like fax machine etc; some conglomerate may have2 or more secretaries; in that only one will be the EXECUTIVE SECRETARY who knows how to execute things and have decision making capacity with sound personal judgment! 

Office Manager:  Its like senior position; one who has more years of experience can be eligible to  serve the Top Management, specifically Chairman's Office.

Hierarchy

lower level

1. Assistant

2. Personal Assistant 

3. Secretary

3. Executive Assistant

4. Executive Secretary

5. Office Manager