The word "PLAU" may seem like it is missing a vowel, but it is actually a legitimate spelling of the word "plow." Using the International Phonetic Alphabet (IPA), we can see that the /aʊ/ sound in "plow" can also be represented by the letters "au" as in "PLAU." However, it is important to note that this spelling is not commonly used and may lead to confusion or misunderstanding. It is recommended to use the standard spelling of "plow" to avoid any confusion.