The word "cosio" is spelled with four letters, and it is pronounced /ˈkoʊ.si.oʊ/. Although it might sound like "cozy-oh," its spelling is unique. The letter "c" is followed by an "o," which is then followed by three vowels, in the order "s-i-o." The last vowel, "o," should not be confused with the "u" sound. This combination of letters and sounds makes "cosio" a distinct word, with no other common English words sharing its spelling or pronunciation.