eparchy vs province

eparchy and province both are nouns.

Word	Noun	Adjective	Verb	Adverb
eparchy	Yes	No	No	No
province	Yes	No	No	No

As nouns, province is a hypernym of eparchy; that is, province is a word with a broader meaning than eparchy:

eparchy: a province in ancient Greece
province: the territory occupied by one of the constituent administrative districts of a nation

Other hypernyms of eparchy include state.

eparchy (noun)	province (noun)
a diocese of the Eastern Orthodox Church	the territory occupied by one of the constituent administrative districts of a nation
a province in ancient Greece	the proper sphere or extent of your activities