The spelling of the word "fennelly" can be explained using the International Phonetic Alphabet (IPA) as /fɛnəli/. The first syllable is pronounced with the short "e" sound, while the second syllable is pronounced with the "uh" sound. The double "n" in the word indicates a nasal consonant, which is produced by narrowing the passage of air through the nose. The final "y" in the word is pronounced as a long "e" sound. Overall, the spelling of "fennelly" closely matches its phonetic transcription.