Letter on position 1 (b) changed: 10 words culls dulls fulls gulls hulls lulls mulls nulls pulls wulls Letter on position 2 (u) changed: 4 words balls bells bills bolls Letter on position 3 (l) changed: 2 words buhls burls Letter on position 4 (l) changed: 2 words bulbs bulks Letter on position 5 (s) changed: 2 words bulla bully