Letter on position 1 (b) changed: 12 words carking darking harking karking larking marking narking parking rarking sarking warking yarking Letter on position 2 (a) changed: 2 words borking burking Letter on position 3 (r) changed: 5 words backing balking banking basking bauking Letter on position 4 (k) changed: 6 words barbing barding barfing barging barning barring