Korean · Pronunciation Guide
chang-mun. An aspirated ㅊ at the front and then three nasal sounds in a row, so the word is almost entirely resonance.
changmun
Two syllables of equal length. The join between the ㅇ and the ㅁ is continuous nasal, so there is no break at all in the middle of the word, and the only interruption anywhere is the burst of air at the very start.
Listen: 창문
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창문 밖을 보세요.
Changmun bakkeul boseyo.
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Listen: 창문 밖을 보세요.
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창문 밖을 보세요 puts 밖을 next, where the tensed ㄲ batchim resyllabifies forward and stays tensed, giving ba-kkeul. A soft nasal noun is therefore followed immediately by a hard tensed consonant.
Letting a g escape between 창 and 문 splits a continuous nasal run into two chunks, and it is the commonest way to make this word sound foreign. The other slip is under-aspirating the ㅊ, which pulls the first syllable toward 장 and removes the one strong consonant the word has.