Synonyms for Rhubarb (same or very similar meaning)
WordNet sense 1 (plants having long green or reddish acidic leafstalks growing in basal clumps; stems (and only the stems) are edible when cooked; leaves are poisonous):
rhubarb plantWordNet sense 2 (long pinkish sour leafstalks usually eaten cooked and sweetened):
pieplantFrom the ODE community, based on WordNetadd/edit