"Z" and "kai" are both letters of the alphabet, but they have different meanings and uses.
Z is the 26th and final letter of the modern English alphabet. It is a voiced alveolar fricative, which means that it is produced by forcing air through a narrow constriction in the alveolar ridge, causing turbulence. Z is a common sound in English, and it appears in many words, such as “zebra,” “pizza,” and “azo.” Kai is a Japanese word that means “ocean.” It is also the name of a popular Japanese anime series, Dragon Ball Z....