4 Syllables:
* Argentina
* Australia
* Botswana
* Cambodia
* Colombia
* Dominica
* Guatemala
* Honduras
* Indonesia
* Jamaica
* Malaysia
* Mozambique
* Namibia
* Nicaragua
* Panama
* Romania
* Slovakia
* Tanzania
* Venezuela
5+ Syllables:
* Luxembourg (5 syllables)
It's worth noting that some country names have variations in pronunciation depending on the language. For example, "United States" can be pronounced with 4 syllables in some dialects.