On Fri, Feb 5, 2021 at 11:47 PM Hans Hagen <j.hagen@xs4all.nl> wrote:

never call a diaeresis an umlaut and vise versa ...

hm
latin is  vice versa (or versa vice)
italian is viceversa 
english is vice versa  

https://forvo.com/word/vice_versa/
I think that  the latin one is the classic (or "restituta") pronunciation, the 
ecclesiastic should be more or less like the italian .

--
luigi