High Quality Content by WIKIPEDIA articles! A vowel cluster is two or more vowels occurring next to each other in a single syllable with no intervening consonant. Vowel clusters are distinct from diphthongs in that diphthongs are vowel combinations in a single syllable involving a quick but smooth movement from one vowel to another while vowel clusters have a slower rate of change of formant trajectories. In phonetics, a vowel is a sound in spoken language, such as English ah! or oh!, pronounced with an open vocal tract so that there is no build-up of air pressure at any point above the glottis. This contrasts with consonants, such as English sh!, where there is a constriction or closure at some point along the vocal tract. A vowel is also understood to be syllabic: an equivalent open but non-syllabic sound is called a semivowel.
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