- tuber - a fleshy underground stem or root serving for reproductive and food storage
--1 is a kind of stalk, stem
--1 has particulars:water chestnut; groundnut, potato bean, wild bean; Jerusalem artichoke; yam; sweet potato - Tuber, genus Tuber - type genus of the Tuberaceae: fungi whose fruiting bodies are typically truffles
--2 is a kind of fungus genus
--2 is a member of Tuberaceae, family Tuberaceae
--2 has members: truffle, earthnut, earth-ball - Tuber, genus Tuber - type genus of the Tuberaceae: fungi whose fruiting bodies are typically truffles