The spelling of the word "eppler" is straightforward when using International Phonetic Alphabet (IPA) phonetic transcription. The word is pronounced as /ˈɛplər/, with the stressed vowel being pronounced as "ɛ" (like "eh" in "bed"). The "p" is pronounced as "p" (like "p" in "pet"), and the "l" is pronounced as "l" (like "l" in "let"). The final "er" sound is pronounced as "ər" (like "er" in "butter"). Therefore, the correct spelling of the word is "eppler."