yam

n 1 (a) edible starchy tuber of a tropical climbing plant 薯蓣（通称山药）. (b) this plant 薯蓣. 2 (US) type of sweet potato 甘薯（通称白薯或红薯）.

xenophobe, xenophobia, xenophobic, Xerox, Xhosa, XL, Xmas, Xt, Y, Y chromosome, Y, y, Y-fronts, yacht, yachtsman, yack, yackety-yack, yah, yahoo, yak, Yale, yammer, yang, Yank, Yankee, yap, yard, yard of ale, yard-arm, yardage, yardstick, yarmulka, yarn, yarrow, yashmak, yaw, yawl, yawn, yaws, yd, ye,