The spelling of the word "stumbo" can be explained using the International Phonetic Alphabet (IPA). The first syllable "stum" is pronounced as /stʌm/, with the "u" being a schwa sound. The second syllable "bo" is pronounced as /bəʊ/, with the "o" being a diphthong sound. The combination of the two syllables results in the pronunciation of the word as /ˈstʌmbəʊ/. Overall, the spelling of "stumbo" accurately represents the sound of the word.