Letter on position 1 (b) changed: 7 words cork dork fork nork pork work york Letter on position 2 (o) changed: 4 words bark berk birk burk Letter on position 3 (r) changed: 6 words boak bock bonk book bosk bouk Letter on position 4 (k) changed: 7 words bora bord bore borm born bors bort