yellow watercress 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.
annual or biennial cress growing in damp places sometimes used in salads or as a potherb; troublesome weed in some localities
Synonyms, antonyms and the broader and narrower relations for yellow watercress come from Princeton University’s WordNet. Full sources and licences.