Vowel the vowel sounds of "flower", , form a triphthong or disyllable, depending on dialect. In phonology, diphthongs and triphthongs are distinguished from sequences of monophthongs by whether the vowel sound may be analyzed into different phonemes or not. For example, the vowel sounds in a two-syllable pronunciation of the word "flower" () phonetically form a disyllabic triphthong, but are phonologically a sequence of a diphthong (represented by the letters ) and a monophthong (represented by the letters ). Some linguists use the terms "diphthong" and "triphthong" only in this phonemic sense. The name "vowel" is often used for the symbols
Vietnamese phonology Any consonant may occur in as an onset with the following exceptions: w: the onglide (sometimes transcribed instead as labialization on a preceding consonant): V: The vowel nucleus V may be any of the following 14 monophthongs or diphthongs: . G: The offglide may be or . Together, V and G must form one of the diphthongs or triphthongs listed in the section on Vowels. C: The optional coda C is restricted to labial, coronal, and velar stops and nasals , which cannot cooccur with the offglides . T: Syllables are spoken with an inherent tone contour: Below is a