Answers:
There is quite a fews word that start with K, so I will only give a few.
kaffir, Kaftan, Kai, Kalashnikov, Kale, Klaneds, Kamikaze,
Kangaroo, Kaolin, Kapok, Kaput, Karaoke, Karate, Karma
Karoo, Kart, Kashbah, Kauri, Kayak, Kazoo, KBE, Kbyte
Kcel, kea, Kebab, Kedgeree, Keel, Keen, Keep, Keg, Kelp
Kelvin, Ken, Kendo, Kept, Kerb, Kerchief, Kerfuffle, Kernel
Kerosene, Kestral, Ketch, Ketchup, Kettle, Key, Keyboard, Keyhole, Keynote, Keyring, Keystone, Kg, KGB, Khan, kHz, Kibosh, Kick, Kid, Kidnap, Kidney, Kill, Kiln, Kilo, Kilobyte, Kilocalorie, Kilogram,
Xe, Xenophobia, Xerox, Xmas, X-ray, Xylem, Xylophone, Xanthate, Xanthein, Xanthite, Xanthium, Xenogamy, Xenolite, Xiphiod
Yacht, Yahoo, Yak, Yanolite, Yap, Yard, Yawn. Yaw, Yawl, Yea, Year, Yearling, Yearning, Yielding, Yew, Yiddish, Yoga, Yoghurt, Yoke, Yolk, Yonder, Youngish, Yourself, Youthful, Yo-yo, Yowl, Yucca, Yummy, Yuletide,
I there is a whole lot more I am sure, but can't think of them all.