Persians and Turks are not Arabs - Ethnic origin.

The word “Iran” means “Land of the Aryans”; this is the self-name of an ancient Indo-European people of the Indo-Iranian branch that came from Central Asia and southern Russia and that together with the Medes settled in what is now Iran between 2000-1500 BC, organized into nomadic tribes. The Turks for their part were semi-nomadic horsemen originally from the steppes of Central Asia, the first records appearing around 2000 BC; the Seljuk Turks arrived in Anatolia (present-day Turkey) at the end of the 11th century after their victory at Malazgirt against the Byzantines, their successors being the Ottoman Turks, founders of the great Ottoman Empire.

Both countries are characterized by their ethnic diversity, although logically the majority of the population is of Persian or Turkish origin:

In Turkey we can also find Kurds, Circassians, Zaza Kurds, Bosnians, Georgians, Albanians, Arabs, Pomaks, Laz, Gypsies, Assyrians and the three officially recognised minorities which are the Greeks, Armenians and Jews. In Iran there are Azeri Turks, Azerbaijanis, Turkmens, Qashqais (yes, like the Nissan car whose name comes from this nomadic tribe), Kurds, Baluchis, Lurs, Bakhtiaris, Gilaks, Afshars, Shahsevans, Jews, Arabs, Armenians, Circassians, Assyrians, Georgians, Afro-Iranians, Mazandarans, Mandaeans... and each region maintains its customs and often its language.