morgan has 7 distinct synonyms spread across 5 of its 6 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 anthropologist who studied the Seneca (1818-1881)
United States biologist who formulated the chromosome theory of heredity (1866-1945)
a Welsh buccaneer who raided Spanish colonies in the West Indies for the English (1635-1688)
soldier in the American Revolution who defeated the British in the battle of Cowpens, South Carolina (1736-1802)
United States financier and philanthropist (1837-1913)
an American breed of small compact saddle horses
Synonyms, antonyms and the broader and narrower relations for morgan come from Princeton University’s WordNet. Full sources and licences.