The Oxford English Dictionary (OED) is an extensive dictionary of the English language, published by the Oxford University Press. It lists words and their definitions, as well as providing etymological information and quotations from various sources. The OED listings include synonyms (SYNS) and words (WDS). Synonyms are words that have the same or similar meanings, while words are defined as a unit of language that conveys meaning. Both synonyms and words are included in the OED listings to provide readers with a comprehensive understanding of the English language.