cardoon has 1 distinct synonym spread across 1 of its 2 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.
southern European plant having spiny leaves and purple flowers cultivated for its edible leafstalks and roots
only parts eaten are roots and especially stalks (blanched and used as celery); related to artichokes
Synonyms, antonyms and the broader and narrower relations for cardoon come from Princeton University’s WordNet. Full sources and licences.