The spelling of the word "Bunah" can be explained phonetically using the International Phonetic Alphabet (IPA) transcription. The first letter "b" is pronounced as "b", the "u" sound is pronounced as "ʊ", the "n" is pronounced as "n", and the second "a" is pronounced as "ə". Hence, the word "Bunah" is pronounced as "BU-nə" in IPA. It is essential to understand the phonetic transcriptions of words to improve their pronunciation and communication.