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).
Lists of words and their synonyms and often their antonyms. For lists of words and phrases that are used to index content and/or retrieve content, and that may include cross-references, see Controlled vocabularies.
