The spelling of the word "N E I" can be explained using the International Phonetic Alphabet (IPA). The IPA symbols for each sound are as follows: /n/ for the initial consonant sound, /e/ represents the short vowel sound in "bed," and /i/ represents the long vowel sound in "tree." The combination of these sounds results in the word "N E I" pronounced as "nay." Adhering to correct spelling and pronunciation is essential in effective communication.