Synonyms for Common Watercress (same or very similar meaning)
WordNet sense 1 (perennial Eurasian cress growing chiefly in springs or running water having fleshy pungent leaves used in salads or as a potherb or garnish; introduced in North America and elsewhere):
Nasturtium officinale, Rorippa nasturtium-aquaticumFrom the ODE community, based on WordNetadd/edit