Mammoth Uncensored Word List:
22 - 10 letter words starting with ko

koeksister kohlrabies kohutuhutu kolinskies kolkhoznik komatiites komondorok konimeters koniophobe koniphobes koniphobia koniphobic koniscopes kookaberra kookaburra kottaboses kotukutuku koulibiaca kourbashed kourbashes kouskouses kowhaiwhai