ethnarch vs swayer

ethnarch and swayer both are nouns.

Word	Noun	Adjective	Verb	Adverb
ethnarch	Yes	No	No	No
swayer	Yes	No	No	No

As nouns, swayer is a hypernym of ethnarch; that is, swayer is a word with a broader meaning than ethnarch:

ethnarch: the ruler of a province (as in the Roman Empire and Byzantine Empire) or certain religious rulers with secular authority
swayer: a person who rules or commands

Other hypernyms of ethnarch include ruler.

ethnarch (noun)	swayer (noun)
the ruler of a province (as in the Roman Empire and Byzantine Empire) or certain religious rulers with secular authority	a person who rules or commands