Vocabulary
The bulk of the vocabulary in Kurdish is of Iranian origin, especially of northwestern Iranian. A considerable number of loanwords come from Semitic, mainly Arabic, which entered through Islam and historical relations with Arab tribes. Yet, a smaller group of loanwords which are of Armenian, Caucasian, and Turkic origins are used in Kurdish, besides some European words. There are also Kurdish words with no clear etymology
Writing system
The Kurdish language uses three different writing systems. In Iran and Iraq it is written using a modified version of the Arabic alphabet, composed by Sa'id Kaban Sedqi. More recently, sometimes with the Latin alphabet in Iraqi Kurdistan. In Turkey, Syria and Armenia, it is written using the Latin alphabet. Kurdish in the former USSR is written with a modified Cyrillic script. There is also a proposal for a unified international recognized Kurdish alphabet based on ISO-8859-1 called Yekgirtú.