:[[Provincia]] is a good word, already in common use in classical Latin.
:Vicipaedia has an age-old preference for "Caput", which, used as a pagename, has to be disambiguated "[[Caput (urbs)]]" because the word's primary meaning is anatomical. It's not incorrect, but I find "Urbs capitalis" clearer and better. Incidentally, that phrase is the direct origin of the French and English ''capitale'', ''capital''. So I often write <nowiki>[[Caput (urbs)|urbs capitalis]]</nowiki>. [[Usor:Andrew Dalby|Andrew Dalby]] ([[Disputatio Usoris:Andrew Dalby|disputatio]]) 13:13, 3 Aprilis 2020 (UTC)