mock orange has 13 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.
large hardy shrub with showy and strongly fragrant creamy-white flowers in short terminal racemes
shrubby thorny deciduous tree of southeastern United States with white flowers and small black drupaceous fruit
small flowering evergreen tree of southern United States
small shrubby deciduous yellowwood tree of south central United States having spines, glossy dark green leaves and an inedible fruit that resembles an orange; its hard orange-colored wood used for bows by Native Americans; frequently planted as boundary hedge
Synonyms, antonyms and the broader and narrower relations for mock orange come from Princeton University’s WordNet. Full sources and licences.