1 Structural Distinction (1.1. 'Horizontal' Onomastic Structure, 1.2. 'Vertical Lexicographic Structure); 2. scope Distinction (2.1. General Lexica, 2.2. lexica Concerning a Single Author; 2.3. Lexica Regarding One Genre; 2.4. Lexica on Particular Themes); 3. Content Distinction of General Lexica (3.1. Lexica with Various Contents; 3.2. Grammatical Lexica; 3.3. Lexica Whose Content is More Properly Morphological and Orthographic; 3.4. Etymological Lexica; 3.5. Synonymic-Differential Lexica); 4. Distinction among Lexica Concerning a Single Author (4.1. Real and Proper Lexica, Whose Entries are Ordered Alphabetically; 4.2. Glossaries, Whose Entries Follow the Order in Which They are Found in the Text); 5. Distinction among Lexiza on Particular Themes (5.1. Geographic Lexica; 5.2. Biographical Lexica)