The correct spelling of the word "Gunderman" can be explained phonetically using the International Phonetic Alphabet (IPA). The first syllable is pronounced as "ɡʌn," which uses a short "u" sound and a hard "g" sound. The second syllable is pronounced as "dər," which uses a schwa sound and a soft "d" sound. The final syllable is pronounced as "mən," which uses a schwa sound and a hard "m" sound. Overall, the phonetic transcription of "Gunderman" is /ˈɡʌndərmən/.