Name the countries whose names can be divided into two non-proper English words.
A country named "Fortune" would count (split into "for" and "tune"). A country named "Zerotania" would not count, because even though you can get "zero" and "tan," you're still left with "ia" at the end.
Not counting words that are proper nouns, abbreviations, dialectic, slang, unusual alternate spellings, or extemely obscure and/or technical.
As for "sud," I see that the dictionary does mark it as "informal," which would seem to suggest that it's slang. I guess it's been in use for so long that I don't think of it as a slang word. Or maybe it's just because I don't associate it with use by young people.
Or if there get to be too many complaints, I might just remove the caveat entirely and say, "This is not intended to be an exhaustive list."