rogue nation vs res publica

rogue nation and res publica both are nouns.

Word	Noun	Adjective	Verb	Adverb
rogue nation	Yes	No	No	No
res publica	Yes	No	No	No

As nouns, res publica is a hypernym of rogue nation; that is, res publica is a word with a broader meaning than rogue nation:

rogue nation: a state that does not respect other states in its international actions
res publica: a politically organized body of people under a single government

Other hypernyms of rogue nation include body politic, commonwealth, country, land, nation, state.

rogue nation (noun)	res publica (noun)
a state that does not respect other states in its international actions	a politically organized body of people under a single government