The spelling of the word "PADU" can be explained through the International Phonetic Alphabet (IPA) phonetic transcription. The word is pronounced as /ˈpædu/ with the first sound being a voiceless bilabial plosive (/p/), followed by a short open-mid front unrounded vowel (/æ/), and ending with a voiced alveolar plosive (/d/) and an unstressed schwa sound (/u/). Overall, the spelling of "PADU" reflects the specific phonemes and sound components of the word when pronounced according to English Phonetics.