The
 Orthodox Church has no specific 'job titles' so to speak, though 
specific members of the Heirarchy will have specific titles according to
 their means. Here are some key examples and Explanations of terms.
Within the Eastern Orthodox Church there are 9 Patriarchs, with 6 Autocephalous Metropolitans who were granted Autocephaly over their various territories by the Patriarchates. Neither of these answer to a higher authority except for The Archbishop of Athens whose territories are partially under Constantinople.
There are six further Autonomous Archbishops/Metropolitans
 who have regional control over their territories, these were granted 
their Autonomy through one of the larger Churches and therefore cannot 
take the title of Patriarch as their head is appointed through another 
Patriarch.
(List Of Eastern Orthodox Heirarchs 
Here)
As well as this, within the Non-Chalcedonian Tradition there are 
6 Oriental Orthodox Patriarchs/Catholicoi, with 4 Titular Patriarchs (and Catholicoi)
 holding Authority over specific areas but recognizing the Spiritual 
Authority of their Patriarch overall. The Oriental Orthodox community 
and Eastern Orthodox are not in communion, due to the Chalcedonian 
Schism of 451, though each retains its structure, with some cases of 
dual Patriarchs in the same place (Alexandria, Antioch, 
Istanbul/Constantinople, Jerusalem)
(List of Non-Chalcedonian Heirarchs 
Here)
Each
 Patriarch has authority over his Patriarchate, with no interference of 
others, though to make major decisions he would need the support of his 
Synod (Bishops in his Juristiction) and in many cases is expected to 
have support from the other Patriarchs,
 which is why the Orthodox Church does not have the changes in Doctrine 
in the way that other communities may.
Titles for heads of Jurisdictions
The head of a specific community will generally be called a Patriarch, Pope or Catholicos. 
Patriarch is the most common title for the leader of an Orthodox Community. 
The term Pope originates in Egypt in the Patristic era and has been continued to be used by the Coptic Community rather than Patriarch. The Official Title of the Greek Orthodox Patriarch of Alexandria is also "Pope and Patriarch of Alexandria and all Africa" though he is commonly simply called Patriarch.
Catholicos means 'Of the Whole' and is used by the Georgian Church in the Eastern Tradition and Armenian and Malankara
 (Indian/Jacobite) Churches in the Oriental Traditions
Titles for Bishops
Within
 each Jurisdiction there are Bishops heading Dioceses or with an 
Administrative role. They will have Titles based upon their role and 
authority 
Metropolitan Bishop/Archbishop
 was the highest Authority until the title Patriarch was created at 
Nicaea in 325. These Bishops can rank above or below Archbishops 
depending on the Tradition (Macedonia and Serbia hold Archbishops as higher,
 most others rank Archbishops lower). They have no specific power or 
direct authority over other Bishops, though have the right to oversee 
Synods and Councils due to their higher authority in the Church
 itself. 
Archbishop
 is the title for a Bishop of greater responsibility than other Bishops,
 He may not always hold a Diocese, as it may be a title for a 
administrative responsibility.
Bishop
 is the title given to the head of  Diocese. The title dates from 
Apostolic times and is present in the writings of St
 paul, as well as St ignarius the Apostolic, who stated that all must be
 done through the Bishop. a Bishop is traditionally a male monastic 
(Since the 6th Century) or Celibate Priest, who has a role over an 
administrative function or Diocese. until recent times, these were only 
Diocesan and could not be transferred between Dioceses (By the Nicene 
Canons they were seen as 'Married' to one) though in recent years in the
 Eastern Orthodox Church this has changed. A Bishop without a Diocese is
 called a 'Titular Bishop' in the Eastern Orthodox and 'General Bishop' 
in the Coptic Orthodox Church. 
The Synod
The
 Synod is the group of meetings. Since Orthodoxy keeps its Conciliar 
Structure, they play a vital role in discussing issues regarding the 
jurisdiction. 
By the Canons of Chalcedon, every Patriarchate 
must hold a 6 Monthly Synod meeting, this was later
 changed to yearly at Trullo. This is also existent in the Oriental 
Orthodox Church who only recognise the first three Ecumenical Councils 
as being truly Ecumenical. The Synodial meetings will often be attended 
by all Bishops in that Patriarchate, who will discuss issues as a whole 
with the Patriarch residing, also holding separate meetings in specific 
councils, regarding different matters which will be reported to the 
Synod as a whole after. Dioceses also hold yearly Synodial meetings to 
discuss matters within that Diocese.