Modern Greek word boza is believed to be cognates with the Old Turkic bus or busum, but the drink under the name boza is first attested in Abu Hayyan al-Gharnati's early 14th century Kipchak Turkic work Kitab al-'idrak li-lisan al-'atrak
Modern Turkish word boza is believed to be cognates with the Old Turkic bus or busum. 
