Letter on position 1 (b) changed: 9 words calls falls galls halls lalls malls palls talls walls Letter on position 2 (a) changed: 4 words bells bills bolls bulls Letter on position 3 (l) changed: 4 words baals baels bails bawls Letter on position 4 (l) changed: 6 words balas balds bales balks balms balus Letter on position 5 (s) changed: 1 word bally