governor vs eparch

governor and eparch both are nouns.

Word	Noun	Adjective	Verb	Adverb
governor	Yes	No	No	No
eparch	Yes	No	No	No

As nouns, eparch is a hyponym of governor; that is, eparch is a word with a more specific, narrower meaning than governor:

Other hyponyms of governor include bey, governor general, military governor, nabob, nawab, proconsul, satrap, vicereine, viceroy.

governor (noun)	eparch (noun)
a control that maintains a steady speed in a machine (as by controlling the supply of fuel)	the governor or prefect of an eparchy in ancient Greece
the head of a state government	a bishop or metropolitan in charge of an eparchy in the Eastern Church