It isn’t what nation state has traditionally meant because of the differing definition of nation, true.. but it has some reason for existing... Nation here mean

It isn’t what nation state has traditionally meant because of the differing definition of nation, true.. but it has some reason for existing... Nation here means national (as in internationally sovereign) and state means the government of that nation (or state :-) — these words can all be synonyms in English) specifically. It concretely means “national government” as you basically mention but with fewer syllables (3) vs (5 or 6) and it’s shorter to type. Do you have any creative alternatives that don’t step on the traditional use?