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Dictionaries may be general (describing the whole vocabulary) and special (specialised) describing a subsystem of the vocabulary (pronunciation, idioms, synonyms, proverbs, professional terms, etc.).
Glossary is an alphabetical list of terms or words found in or relating to a specific subject, text, or dialect, with explanations; a brief dictionary
The most important problems in dictionary compiling are as follows: 1) selection of lexical units; 2) their arrangement; 3) setting of the entries; 4) selection and arrangement of word -meanings; 5) definition of meanings; 6) illustrative material, etc.