The word "NIWEN" is not a commonly used word in English. Its spelling might be unfamiliar to many, but the phonetic transcription of this word in IPA (International Phonetic Alphabet) could shed some light on its pronunciation. The IPA transcription of "NIWEN" would be /naɪ.wɛn/. This means that the first syllable is pronounced like "nigh," while the second syllable is pronounced like "wen." However, it is unclear what this word means or where it originated from, making it difficult to fully understand its pronunciation and spelling.