People who speak the Uzbek dialects of Oghuz and Kipchak, as well as Kazakh, Karakalpak, and Turkmen, live in the Khorezm dialectal zone, which is a component of the Turkic linguistic region and of the Uzbek language massif. The Oghuz group of Turkic languages, which historically include Uzbek and Turkmen, has both similarities and differences. Phonetics, particularly the vowel system, shows these similarities and contrasts. The Old Turkic language's phonological structure is known to have 8 vowel phonemes. Due to historical growth, impact from related and unrelated languages (metization and hybridization), and different vocalisms, these languages have different levels of retention of shared elements. Research has demonstrated the presence of Tajik components in these dialects as well as Uzbek elements in the Tajik language as a result of the close and ongoing contact between urban and city-type dialects of the Uzbek language and the Tajik language. The Oghuz dialects of Uzbek and Turkmen, who traditionally inhabited in the same region, have distinctive qualities that set them apart from other Uzbek and Turkmen language dialects and make them exclusive to this region. The back row, semi-labial, low-wide vowel ā ,for instance, started to be actively utilized in the Uzbek dialects of the dialectal zone under the influence of the Uzbek literary language ,like ālíj, āmmavíj. In the zone's Turkmen languages, this vowel ,therefore ,started to occur irregular. The article offers details on the typical indications of vowel sounds in Uzbek and Turkmen, two languages spoken in the region, according to the sign of quality.