The word "TEIN" is spelled with a capital letter 'T', followed by the letters 'E', 'I', and 'N'. This word is usually pronounced as /teɪn/ in IPA phonetic transcription. The 'T' sound is pronounced as a voiceless alveolar stop, while the 'E' and 'I' sounds are both pronounced as a long vowel sound. The final 'N' is pronounced as a voiceless alveolar nasal. It is important to spell words accurately to ensure proper comprehension and effective communication.