The word "exceller" is not a correct spelling in English. However, it is possible to analyze the IPA phonetic transcription of this non-existent word to explain how it would be pronounced. According to IPA, "exceller" would be pronounced as /ɛkˈsɛlər/. This means that it would be pronounced with a short "e" sound, followed by a hard "k" and "s" sound, with a short "e" vowel in the middle, and ending in a light "r" sound. It's important to remember that proper spelling is essential for clear communication in English.