| 21. | He authored a series of Georgian dictionaries and influential works on the structure and history of Caucasian languages.
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| 22. | As a result, he became one of the premier experts of Caucasian languages to work in French.
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| 23. | Igor Diakonoff and others have suggested ties between the Hurro-Urartian languages and the Northeastern Caucasian languages.
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| 24. | Two-vowel systems are very rare worldwide, but are also found in some Northwest Caucasian languages.
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| 25. | Language families unique to this region are Northwest Caucasian languages, Northeast Caucasian languages and South Caucasian languages.
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| 26. | Language families unique to this region are Northwest Caucasian languages, Northeast Caucasian languages and South Caucasian languages.
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| 27. | Language families unique to this region are Northwest Caucasian languages, Northeast Caucasian languages and South Caucasian languages.
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| 28. | This case is found in Northeast Caucasian languages like ergative-case noun, marks the postessive case.
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| 29. | In Adyghe, like all Northwest Caucasian languages, morphology is the most important part of the grammar.
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| 30. | The Hittite language was a distinct member of the language isolate but may have been a Northwest Caucasian language.
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