Letter on position 1 (b) changed: 12 words dilled filled gilled hilled killed lilled milled nilled pilled rilled tilled willed Letter on position 2 (i) changed: 4 words balled belled bolled bulled Letter on position 3 (l) changed: 1 word birled Letter on position 4 (l) changed: 2 words bilged bilked Letter on position 6 (d) changed: 2 words biller billet