The spelling of the word "NIALMN" is indeed tricky. The word is spelled as /naɪælmən/ in IPA phonetic transcription. The first two letters "NI" are pronounced as /naɪ/, like in the word "night". The following letters "ALM" are pronounced as /ælm/, like in the word "calm". Lastly, the letter "N" is pronounced as /n/ sound. So when put together, "NIALMN" is pronounced as /naɪælmən/. It's important to pay attention to the different syllables while pronouncing it to avoid confusion.