different between eparch vs eparchy

English

From Ancient Greek ??????? (éparkhos), from ??? (epí, “over”) + ????? (arkhós, “ruler”).

eparch (plural eparchs)

(historical, Ancient Greece) The governor or prefect of a province.
The ruler of an eparchy.
(Eastern Orthodoxy) The metropolitan bishop of a province or eparchy.
- 2011, Norman Davies, Vanished Kingdoms, Penguin 2012, p. 246:
  An Orthodox eparch, or metropolitan bishop, was installed in Polatsk in 992.

From Ancient Greek ??????? (eparkhía).

eparchy (plural eparchies)

one of the districts of the Roman Empire at the third echelon
one of the administrative sub-provincial units of post-Ottoman independent Greece
in pre-schism Christian Church, name for a province under the supervision of the metropolitan
in Eastern Christendom, diocese of a bishop

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