In this study which analyzes nouns given to dictionary in the European languages, brief information for these languages are given in the beginning by demonstrating certain dictionary names in these languages. Then, the meanings, origins, structures, types of the nouns for the dictionaries like glossary, lexicon, thesaurus, dictionary, vocabulary, Wortschatz, wordbook, Wörterbuch, slovár’ are given and their differences are explained. At the end of the study, it is understood that the dictionary names in the European languages started with Greek originated words (glossary, lexicon, thesaurus), continued its development with Latin words (dictionary, vocabulary) coexisting the Greek ones, and finally matured with national dictionary names (Wortschatz, wordbook, Wörterbuch, slovár’). Differences may also be observed depending on the preparation purposes of these dictionaries. Moreover, it is also observable that a dictionary name in a dominant language representing a language family can be found in the other relative languages or in the languages of the small communities either in the same or a different form. It is understood that the names of dictionaries are based upon the nouns like ‘voice, word, treasure’, or the verbs like ‘explain, say, hide, voice’. For instance, glossary ‘book of explained words’ (gloss ‘to explain’, glōssa ‘language, word to be explained’); lexicon ‘word list’ (légein, ‘to speak’, leksi-s ‘a saying, spoken word’); thesaurus ‘treasure, word treasure’ (thē ‘hide’); dictionary ‘wordbook’ (dīcere ‘to say’); vocabulary ‘word treasure’ (vōx, vōc- ‘voice, to voice’, vocā-re, ‘voice, call’); Wortschatz ‘word treasure’ (wer ‘to say’); (wer ‘to say’); Wörterbuch ‘wordbook’ (wer ‘to say’); slovár’ ‘dictionary’ (sloviti ‘to say’, slov ‘word’ [<zvuk ‘sound’])The aim of this study is to analyse nouns used to denotedictionaries in the European languages. In the study, those nouns areshown on a diagram by giving their form in the European languages,and, respectively, their meanings, origins, structures, types and worksin which these names are encountered are given and their differencesare explained.I. Glossary¸ At the end of the Middle Age, in order to make theold, closed, incomprehensive Latin words more understandable, wordexplanations between the lines were started to be given. To make Latintexts more readable, word explanations and commentaries (glosses)were collected in the index (glossary) which explained meanings ofwords and terms mostly in a single alphabetic list, like in the 8thcentury Corpus Glossary. Consequently, glossaries transmitted from theGreek to other European languages were prepared as small dictionarieswhich explained old or incomprehensible or foreign words with newwords. The root of glossary comes from the Latin gloss meaning “acommentary, explanation. The word is originally Greek and it wastransmitted to Latin from Greek. Greek γλῶσσα [glōssa] is the ‘tongue’;also, ‘a tongue’, ‘language’, ‘a word needing explanation’. In Latin,glōssa means ‘a difficult word (closed, obscure) requiring explanation’.In the Middle English, it was used with single s as glose; however, theverb glosen meaning ‘to explain, to comment; to make between the lineexplanation’ was more common than the noun. This ME. glose is fromthe OF. glose, ‘a glosse’; Cot. But the L. from glosse (with double s) wassubtituted for the F. form in the 16th century. Its derivatives; gloss,(verb); gloze, gloss-ar-y, glosso-graphy, glosso-logy; glottis. Greekoriginated word glossary is used in Latin as glōssārium, in English asglossary, in German as Glossar, in French as glossair, in Italian asglossario, in Spanish as glosario, in Portuguese as glossário, in Dutchas glossarium, in Swedish as glossar, in Norwegian as glossar.The word glossary has been in use since the antiquity and fromits roots many words have been derived for dictionary terminology. Forinstance, glossarial mean ‘peculiar to explanation, of dictionary;annotative, interpretive; small dictionary or like’; glossography, means‘explanation, interpretation; small dictionary collection; writing smalldictionary, writing glossary; a work on language’; glossarist, glosser,glossist, glossator, glossographer ‘one who explains and comments; onewho interprets the laws of the Roman Catholic Church in the MiddleAges; small dictionary editor; glossary writer, lexicographer’.II. Lexicon, is a word used for dictionary generally in ancientlanguages like in Europe Greek, Latin, Arami, Hebrew, Assyrian andArabic. As known, the dictionary written by the Byzantine Aristophanes(257? -?180 B.C.), the director of the Library of Alexandria, is calledLexicon. This dictionary provides definitions and a list for rare anddifficult Greek words.Leg, to collect; hence, to put together, to read. Gk. λέγєιν [légein]to collect, read, L. leg-ere, to read, de-lec-tus, choice, lec-tus, chosen.Ex. logic, eclogue, syllogism, and the suffix –logy; legend, legion, elect,delight, &c.“Lexicon, a dictionary. (Gk.) In Blount’s Gloss., ed. 1674. – Gk.λεξικόν (with βιβλίον, a book, understood), a lexicon; properly neut. ofλεξικόs, adj., of or for words. – Gk. λέξι-s, a saying, speech. – Gk. λέγειν,to speak; see Legend. Der. lexico-graph-y, lexico-graph-i-c-al, lexicograph-i-c-al-ly,lexico-graph-er; all from γράφειν, to write; see Graphic.”Lexicon [lek'sikən] n. a dictionary (usu. applied to Greek, Hebrew,Arabic or Syriac)… Gk. lexikon, orig. neut. of lexikos, pertaining towords, from lexis, a saying, a word, from legein, to speak. Greekoriginated word lexikón is lexicon in Latin, Lexikon in German, lexique inFrench, lexiconv in English, lessico in Italian, lexicon in Romanian,lexicon in Dutch, лeкcикoн (=lexikon) in Russian, lexikon in Swedish,leksikon in Norwegian, leksikonas in Lithuanian.The word Lexicon has also provided words for dictionaryterminology. For exam