citizenry vs Ionian

citizenry and Ionian both are nouns.

Word	Noun	Adjective	Verb	Adverb
citizenry	Yes	No	No	No
Ionian	Yes	Yes	No	No

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

citizenry: the body of citizens of a state or country
Ionian: the ancient Greek inhabitants of Attica and related regions in Ionia

Other hyponyms of citizenry include country people, countryfolk, Achaean, Arcado-Cyprians, Aeolian, Dorian, electorate, governed.

citizenry (noun)	Ionian (noun)
the body of citizens of a state or country	the ancient Greek inhabitants of Attica and related regions in Ionia
	a member of one of four linguistic divisions of the prehistoric Greeks, spoken in the central west coast of Asia Minor, the islands of Chios and Samos, islands across the central Aegean, and on the large island of Euboea north of Athens

citizenry (adjective)	Ionian (adjective)
	of or pertaining to the ancient Ionians who lived in Attica and related territories, to their Ionic dialect of Greek, or to their culture