The correct spelling of the word "Sulphonthal" can be confusing due to its complex pronunciation. The word is pronounced as /sʌlfɒnθəl/, with the stress on the second syllable. The first syllable is pronounced as "sul-fon", while the second syllable is pronounced as "thal." The word refers to a crystalline compound that is used as an anticonvulsant drug, and its correct spelling is essential to avoid any misunderstandings regarding dosage or medication instructions.