Vowels Uyghur has a seven-vowel inventory, with and not distinguished. The vowel letters of the Uyghur language are, in their alphabetical order (in the Latin script), , , , , , , , . There are no diphthongs.
Hiatus occurs in some loanwords.Uyghur vowels are distinguished on the bases of height, backness and roundness. It has been argued, within a lexical phonology framework, that has a back counterpart , and modern Uyghur lacks a clear differentiation between and . Uyghur vowels are by default
short, but long vowels also exist because of historical vowel
assimilation (above) and through loanwords. Underlyingly long vowels would resist vowel reduction and
devoicing, introduce non-final stress, and be analyzed as |Vj| or |Vr| before a few suffixes. However, the conditions in which they are actually pronounced as distinct from their short counterparts have not been fully researched. The high vowels undergo some tensing when they occur adjacent to
alveolars (),
palatals (),
dentals (), and post-alveolar
affricates (), e.g.
chiraq 'lamp',
jenubiy 'southern',
yüz 'face; hundred',
suda 'in/at (the) water'. Both and undergo apicalisation after alveodental continuants in unstressed syllables, e.g.
siler 'you (plural)',
ziyan 'harm'. They are medialised after or before , e.g.
til 'tongue',
xizmet 'work; job; service'. After velars, uvulars and they are realised as , e.g.
giram 'gram',
xelqi 'his [etc.] nation',
Finn 'Finn'. Between two syllables that contain a rounded back vowel each, they are realised as back, e.g.
qolimu 'also his [etc.] arm'. Any vowel undergoes laxing and backing when it occurs in
uvular () and
laryngeal (glottal) () environments, e.g.
qiz 'girl',
qëtiq 'yogurt',
qeghez 'paper',
qum 'sand',
qolay 'convenient',
qan 'blood',
ëghiz 'mouth',
hisab 'number',
hës 'hunch',
hemrah 'partner',
höl 'wet',
hujum 'assault',
halqa 'ring'. Lowering tends to apply to the non-high vowels when a syllable-final liquid assimilates to them, e.g.
kör 'look!',
boldi 'he [etc.] became',
ders 'lesson',
tar 'narrow'. Official Uyghur orthographies do not mark vowel length, and also do not distinguish between (e.g., 'knowledge') and back (e.g., 'my language'); these two sounds are in
complementary distribution, but phonological analyses claim that they play a role in vowel harmony and are separate phonemes. only occurs in words of non-Turkic origin and as the result of vowel raising. Uyghur has systematic
vowel reduction (or vowel raising) as well as vowel harmony. Words usually agree in vowel backness, but compounds, loans, and some other exceptions often break vowel harmony. Suffixes surface with the rightmost [back] value in the stem, and are transparent (as they do not contrast for backness). Uyghur also has rounding harmony.
Consonants Uyghur voiceless stops are aspirated word-initially and intervocalically. The pairs , , , and alternate, with the voiced member devoicing in syllable-final position, except in word-initial syllables. This devoicing process is usually reflected in the official orthography, but an exception has been recently made for certain Perso-Arabic loans. Voiceless phonemes do not become voiced in standard Uyghur. Suffixes display a slightly different type of consonant alternation. The phonemes and anywhere in a suffix alternate as governed by
vowel harmony, where occurs with front vowels and with back ones. Devoicing of a suffix-initial consonant can occur only in the cases of → , → , and → , when the preceding consonant is voiceless. Lastly, the rule that /g/ must occur with front vowels and with back vowels can be broken when either or in suffix-initial position becomes assimilated by the other due to the preceding consonant being such. Loan phonemes have influenced Uyghur to various degrees. and were borrowed from Arabic and have been nativized, while from Persian less so. only exists in very recent Russian and Chinese loans, since Perso-Arabic (and older Russian and Chinese) became Uyghur . Perso-Arabic loans have also made the contrast between and phonemic, as they occur as allophones in native words, the former set near front vowels and the latter near back vowels. Some speakers of Uyghur distinguish from in Russian loans, but this is not represented in most orthographies. Other phonemes occur natively only in limited contexts, i.e. only in few interjections, , , and rarely initially, and only morpheme-final. Therefore, the pairs , , and do not alternate.
Phonotactics The primary
syllable structure of Uyghur is CV(C)(C). == Orthography ==