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
Rheinische Dokumenta two long monophthongs. Varying lengths of diphthongs are not noted in Rheinische Dokumenta, which at least does not create ambiguities within a dialect. There are no triphthongs, although diphthongs can be followed by schwas in some languages. If, for instance, Rheinische Dokumenta was used in writing Westphalian, triphthongs would be written in a manner analogous to the diphthongs, using three adjacent letters of vocals. Since most dialects follow the German, and Lower Franconian, rule of final-obstruent devoicing, voiced consonants cannot, or hardly ever, appear at the end of a word or sentence. This is one of the major differences between