haldane has 9 distinct synonyms spread across 4 of its 4 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.
Scottish geneticist (son of John Haldane) who contributed to the development of population genetics; a popularizer of science and a Marxist (1892-1964)
Scottish physiologist and brother of Richard Haldane and Elizabeth Haldane; noted for research into industrial diseases (1860-1936)
Scottish writer and sister of Richard Haldane and John Haldane (1862-1937)
Scottish statesman and brother of Elizabeth and John Haldane (1856-1928)
Synonyms, antonyms and the broader and narrower relations for haldane come from Princeton University’s WordNet. Full sources and licences.