The spelling of the word "Adao" can be phonetically explained using the International Phonetic Alphabet (IPA) as /əˈdaʊ/. The first syllable is pronounced with the schwa sound, which represents the vowel sound in "about" or "ago". The second syllable is pronounced with a diphthong, which consists of the vowel sounds in "cow" and "out". Thus, the correct spelling for this word is "Adao", with the stress on the second syllable. Phonetic transcription helps to accurately represent the sounds of words, which can be helpful for pronunciation and language learning.