cooper has 5 distinct synonyms spread across 4 of its 5 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
United States industrialist who built the first American locomotive; founded Cooper Union in New York City to offer free courses in the arts and sciences (1791-1883)
United States film actor noted for his portrayals of strong silent heroes (1901-1961)
Synonyms, antonyms and the broader and narrower relations for cooper come from Princeton University’s WordNet. Full sources and licences.
United States novelist noted for his stories of American Indians and the frontier life (1789-1851)