The spelling of the word "obeirne" is rather tricky due to its pronunciation. In IPA phonetic transcription, it is written as /oʊˈbɛərn/. The unusual combination of the letters "ei" in the middle of the word creates confusion for many speller. The sound of the letter "e" here is pronounced as "air," which is why the word is spelled with an "e" rather than an "i." By breaking down the pronunciation with IPA symbols, it becomes easier to understand the spelling of this word.