The spelling of the word "Oaker" is quite simple, despite its unusual appearance. The first sound is "o," which is pronounced as a short "o" sound (IPA symbol: ɑ), followed by the "a" sound (IPA symbol: eɪ), and then the "k" sound (IPA symbol: k). Finally, the word ends with the "er" sound (IPA symbol: ər), which is pronounced as a schwa sound. So the correct phonetic transcription of the word "Oaker" is ɑeɪkər. Despite its spelling, the pronunciation is not overly difficult once you become familiar with the IPA symbols.