Letter on position 1 (b) changed: 10 words culling dulling fulling gulling hulling lulling mulling nulling pulling wulling Letter on position 2 (u) changed: 4 words balling belling billing bolling Letter on position 3 (l) changed: 3 words bugling burling butling Letter on position 4 (l) changed: 3 words bulbing bulging bulking