The spelling of the word "Louthan" can be explained by its phonetic transcription: /luːθən/. The "ou" combination is a phonetic representation of the /uː/ sound, as in "blue". The "th" sound is represented by the phonetic symbol /θ/. The final "an" sound is spelled the same way it sounds. Therefore, "Louthan" is spelled the way it is to accurately represent its unique pronunciation. Phonetic transcriptions are a useful tool for understanding the spelling of words and their corresponding sounds.