The spelling of the word "OOST" may seem confusing to those unfamiliar with Dutch phonetics. However, using the International Phonetic Alphabet (IPA) can help to understand the pronunciation and therefore, the spelling of this word. In Dutch, the "oo" sound is pronounced as a long "o" sound, represented by /o:/ in IPA. The "s" sound is represented by /s/ and the "t" sound is represented by /t/. So, the correct pronunciation and spelling of "OOST" is /o:st/ in IPA.