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Persian and Arabic are two different languages.
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The relationship between Arabs and Persians has always been a source of controversy, not only owing to the contemporary power struggle in the region, but also because of a long history of rivalry that formed an integral part of the national psyche of both people. Iranian intellectual Sadek Zibakalam provides deep insight into the different levels of this enduring animosity.
hey are unrelated languages from different linguistic families. Persian is more related to English than it is to Arabic. Persian languages are spoken in countries like Iran, Afghanistan, Azerbaijan and Turkmenistan etc., Arabic is spoken in the Arabian peninsula, Iraq and points west of there to Israel, and in North Africa (Egypt, Morrocco). Persia is a distinct civilization from the arabs, and was before Islam as well. They are also mostly Shia Muslims whereas Arabs are mostly Sunni Muslims. Persians have different food, musical traditions, and literary traditions. Really, all they have in common is being nominally Muslim and from roughly the same basic part of the world, but otherwise they don't have that much in common.
They didn't become Arabs following the revolution, they just got a new form of government. It's true that Persians who don't identify with the revolution prefer to call themselves Persians rather than Iranians, but no Persian would call themselves an Arab, it'd be like if Austria became more devoutly Catholic again and people started calling them Polish because of that.