The capital of Afghanistan is Kabul, a city of 5 letters. Osama is another 5 letter word associated with Afghanistan, as it was the surname of the former leader of the Taliban, who had a stronghold in the country. RISK is a 4 letter word that is often associated with Afghanistan due to the ongoing conflict and instability in the region. Herat is another 5 letter word associated with Afghanistan, as it is a major city in the western part of the country, close to the border with IRAN. IRAN is a 4 letter word that shares a border with Afghanistan.