hypoplastic dwarf has 3 distinct synonyms spread across 1 of its 1 sense. 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.
an achondroplastic dwarf whose small size is the result of a genetic defect; body parts and mental and sexual development are normal
Synonyms, antonyms and the broader and narrower relations for hypoplastic dwarf come from Princeton University’s WordNet. Full sources and licences.