The spelling of the word "bachner" can be explained using the International Phonetic Alphabet (IPA). The IPA phoneme /b/ corresponds to the English letter "b," while /a/ represents the "ah" sound. The IPA phoneme /k/ represents the "k" sound, and /n/ corresponds to the letter "n." The final two letters, /e/ and /r/, represent the "eh" sound and the "r" sound, respectively. Therefore, the correct spelling of the word "bachner" can be transcribed in IPA as /ˈbɑknər/.