To be clear, in general the vocative is a case eg in Czech and other balto slavic languages (except eg standard Russian while colloquial Russian is developing a new unrelated one).
In Latin tho, it’s more a relict. Other cases have relicts, too, still I wouldn’t say Latin has the locative.
I would argue that being a relict is a spectrum. Technically, it is a case with many syncretism to nominative, since it is obligatory for those nouns. In the context of LAtiN hAs sOo0 ManY cAsES, it’s not.
To be clear, in general the vocative is a case eg in Czech and other balto slavic languages (except eg standard Russian while colloquial Russian is developing a new unrelated one).
In Latin tho, it’s more a relict. Other cases have relicts, too, still I wouldn’t say Latin has the locative.
I would argue that being a relict is a spectrum. Technically, it is a case with many syncretism to nominative, since it is obligatory for those nouns. In the context of LAtiN hAs sOo0 ManY cAsES, it’s not.
The Ohio State University seems to think these are both cases: https://classics.osu.edu/Undergraduate-Studies/Latin-Program/Grammar/Cases/latin-case .
I called it relicts but it’s basically what I said. Maybe vestiges is the better word in English, in German we say “Relikte”.