Letter on position 1 (b) changed: 8 words culler duller fuller guller huller luller muller puller Letter on position 2 (u) changed: 2 words baller biller Letter on position 3 (l) changed: 3 words bugler burler butler Letter on position 4 (l) changed: 2 words bulger bulker Letter on position 6 (r) changed: 2 words bulled bullet