Ku-Klux-Klan |ˌkuː klʌks ˈklæn| — A secret society that uses terrorism to promote white supremacy. It primarily operated in the southern United States of America during the mid-1900s.

kudos |ˈkuːdɑːs| — an expression of approval and commendation

kudu |ˈkuːduː| — either of two spiral-horned antelopes of the African bush

kukri |ˈkʊkriː| — A curved Nepalese knife used especially by Gurkha fighters.

kulak |kʊˈlɑːk| — (historical) A prosperous peasant in the Russian Empire or the Soviet Union, who owned land and could hire workers.

kumiss |ˈkuːmɪs| — Alternative spelling of koumiss.

Kurd |ˈkɜːd| — a member of a largely pastoral Islamic people who live in Kurdistan; the largest ethnic group without their own state

Kurdish |ˈkɜːdɪʃ| — an Iranian language spoken in Turkey and Iran and Iraq and Syria and Russia

Kuwaiti |kuːˈweɪtɪ| — a native or inhabitant of Kuwait