The spelling of the word "hepner" is interesting because it isn't a commonly used word in English. However, the pronunciation of the word is straightforward: /ˈhɛpnər/. This is because each letter in the word corresponds to only one sound in the IPA phonetic alphabet. The "h" is pronounced as "h," the "e" as "ɛ," the "p" as "p," the "n" as "n," and the last "e" as "ə." Therefore, the spelling of "hepner" accurately represents its pronunciation in English.