Uzbek

Centuries of intense contact with Persian and Tajik — both Indo-European languages that don't have vowel harmony — have weakened the system. The literary Uzbek standard codified in the Soviet era is based on dialects with the most reduced harmony, especially the Tashkent variety. Some rural Uzbek dialects preserve fuller harmony, but the standard language is closer to vowel-harmony-free than to a typical Turkic system.

Uzbek has switched scripts more times than almost any other major language in the past century. Originally written in a Perso-Arabic script (until 1928), then a Latin alphabet (1928–1940), then Cyrillic (1940–1992), then back to Latin (1992 onward, with several revisions through the 2010s and 2020s). Cyrillic remains in widespread use alongside the official Latin script in publishing and signage.

Uzbekistan as the national language, with roughly 22 million native speakers. Substantial Uzbek communities live in northern Afghanistan, Tajikistan (especially the Sughd region and parts of southern Tajikistan), Kyrgyzstan (the Fergana Valley), and Kazakhstan. The Uzbek diaspora extends to Turkey, Saudi Arabia, the United States, and Russia.

Both are Turkic, but in different branches. Turkish is Oghuz; Uzbek is Karluk. The two languages share grammatical structure (agglutinative, SOV, suffixed cases, no grammatical gender) and many cognates, and a Turkish speaker can puzzle out written Uzbek with effort. Spoken mutual intelligibility is more limited because of vowel and consonant differences.

Among Turkic languages, Uzbek's reduced vowel harmony makes it slightly easier than Turkish in one respect, but the script situation (mixed Cyrillic and Latin in real-world use) adds friction. Grammar is regular and agglutinative, with no grammatical gender. Vocabulary draws from Turkic, Persian, and Arabic sources, which means lots of loanwords to learn but also predictable patterns once the strata become familiar.