The spelling of the word "BURGWHAR" can be explained using the IPA phonetic transcription system. The word is pronounced as /bɜːɡwɑː/, where the "u" sound is pronounced as "er". The "gh" is silent, and the "w" is pronounced as a separate sound from the "u". The "a" is pronounced as "ah", making the word sound like "burg-wah". This unique spelling and pronunciation add to the complexity of the English language, making it important to learn and understand pronunciation rules.