According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern -----KO. That is, seven letter words with 6th letter K and 7th letter O. In alphabetical order, they are:
finnsko
Indians is a word with 7 letters without an k or n o
rhythms
kangaroo?
Ketchup
seven letter word beginning with the letter k as being acquainted with
embarks
haddock
bulwark
berserk?
knuckle, keratin, knavish
bullock
wedlock
Kibbutz, Kitchen
outlook, oarlock