Lists of words and/or phrases that are used to index and/or retrieve content, and that may include cross-references. For lists of words and their synonyms and often their antonyms see Thesauri (Dictionaries).
Here are entered general works on subject headings and lists of subject headings in the English language. This heading may be further subdivided by the topic of the subject headings, e.g., Subject headings--Aeronautics.
