alcea rosea has 2 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.
plant with terminal racemes of showy white to pink or purple flowers; the English cottage garden hollyhock
Synonyms, antonyms and the broader and narrower relations for alcea rosea come from Princeton University’s WordNet. Full sources and licences.