The spelling of the word "moulden" may appear confusing to some due to the use of the letter "o" instead of "u". However, when using the International Phonetic Alphabet (IPA), the spelling becomes clearer. The IPA transcription for "moulden" is /ˈməʊldən/. The "o" in the spelling represents the phoneme /əʊ/ in the IPA, which is the same sound as the "o" in "go" or "bow". So, while the spelling may appear unconventional, it accurately represents the sound of the word.