Turkish vocabulary is the set of words within the Turkish language. The language widely uses agglutination and suffixes to form words from noun and verb stems. Besides native Turkic words, Turkish vocabulary is rich in loanwords from Arabic, Persian, French and other languages. This article is a companion to Turkish grammar and contains some information that might be considered grammatical. The purpose of this article is mainly to show the use of some of the yapım ekleri "structural suffixes" of the Turkish language, as well as to give some of the structurally important words, like pronouns, determiners, postpositions, and conjunctions. Origins In the ninth century, Turks began to convert to Islam and to use the Arabic alphabet. When the Seljuk Turks overran Iran (Persia), they adopted for official and literary use the Persian language. Thus educated Turks had available for their use the vocabularies of three languages: Turkish, Arabic, and Persian. When the Ottoman Empire arose out of the remains of the Selcuk Empire in Anatolia, its official language, Osmanlıca or Ottoman Turkish, became the only language to approach English in the size of its vocabulary (according to #Lewis). However, common people continued to use kaba Türkçe or "rough Turkish" which contained much fewer loanwords and which is the basis of the modern Turkish language. With the advent of the Turkish Republic in 1923 came the attempt to unify the languages of the people and the administration, and to westernize the country. The modern Turkish alphabet, based on the Latin script, was introduced. Also, Arabic and Persian words were replaced, as possible, by: Turkish words surviving in speech, obsolete Turkish words, new words formed regularly from the agglutinative resources of Turkish, thoroughly new words or formations. However, still a large portion of current Turkish words have Arabic or Persian origins. Turkish has words borrowed from Greek due to the Ottoman Empire having conquered the Byzantine Empire. There are also borrowings from other European languages, or from the common technical vocabulary of Europe. In the latter case, the borrowings are usually taken in their French pronunciation. Nouns Turkish nouns and pronouns have no grammatical gender (the same pronoun o means "he", "she" or "it"), but have six grammatical cases: nominative or absolute (used for the subject or an indefinite direct object), accusative (used for a definite direct object), dative (= to), locative (= in), ablative (= from), genitive (= of). There