yak

n wild or domesticated ox of Central Asia, with long horns and hair 　牛（产於中亚、 西藏）.

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