A thesaurus is a reference work that lists words grouped together according to similarity of meaning (containing synonyms and sometimes antonyms), in contrast to a dictionary, which contains definitions and pronunciations.
Controlled vocabulary of subject terms used to index journal articles, books, book chapters, videos, and dissertations cited in the AgeLine Database, which is produced by AARP that focuses on the subject of aging and middle-aged and older adults, particularly addressing the social, psychological, economic, policy, and health care aspects of aging.