R. S. Ginzburg, S. S. Khidekel, G. Y. Knyazeva, A. A. Sankin a course in modern english

§ 7. Arrangement of Entries

The order of arrangement of the entries to be included is different in different types of dictionaries and even in the word-books of the same type. In most dictionaries of various types entries are given in a single alphabetical listing. In many others the units entered are arranged in nests, based on this or that principle.
In some explanatory and translation dictionaries, for example, entries are grouped in families of words of the same root. In this case the basic units are given as main entries that appear in alphabetical order while the derivatives and the phrases which the word enters are given either as subentries or in the same entry, as run-ons that are also alphabetised. The difference between subentries and run-ons is that the former do include definitions and usage labels, whereas run-on words are not defined as meaning is clear from the main entry (most often because they are built after productive patterns).
Compare, for example, how the words despicable and despicably are entered in the two dictionaries:
COD despicable, a. Vile, contemptible Hence — LY² adv.
WNWD despicable adj. that is or should be despised; contemptible. despicably adv. in a despicable manner
In synonym-books words are arranged in synonymic sets and its dominant member serves as the head-word of the entry.
In some phraseological dictionaries, e.g. in prof. Koonin’s dictionary, the phrases are arranged in accordance with their pivotal words which are defined as constant non-interchangeable elements of phrases.
A variation of the cluster-type arrangement can be found in the few frequency dictionaries in which the items included are not arranged alphabetically. In such dictionaries the entries follow each other in the descending order of their frequency, items of the same frequency value grouped together.
Each of the two modes of presentation, the alphabetical and the cluster-type, has its own advantages. The former provides for an easy finding of any word and establishing its meaning, frequency value, etc. The latter requires less space and presents a clearer picture of the
218
relations of each unit under consideration with some other units in the language system, since words of the same root, the same denotational meaning or close in their frequency value are grouped together.
Practically, however, most dictionaries are a combination of the two orders of arrangement. In most explanatory and translation dictionaries the main entries, both simple words and derivatives, appear in alphabetical order, with this or that measure of run-ons, thrown out of alphabetical order.
If the order of arrangement is not strictly alphabetical in synonym-books and phraseological dictionaries, very often an alphabetical index is supplied to ensure easy handling of the dictionary.
Some frequency dictionaries, among them nearly all those constructed in our country, contain two parts with both types of lists.