1. [n]  an iron bucket used for hoisting in wells or mining
2. [n]  coarsely ground grain in the form of pellets (as for pet food)

KIBBLE is a 6 letter word that starts with K.

1. \Kib"ble\, v. t.
   To bruise; to grind coarsely; as, kibbled oats. [Prov.Eng.]
   --Halliwell.
   
   

2. \Kib"ble\, n.
   A large iron bucket used in Cornwall and Wales for raising
   ore out of mines. [Prov. Eng.] [Written also {kibbal}.]