Letter on position 1 (c) changed: 11 words buffs duffs fuffs guffs huffs luffs muffs nuffs puffs ruffs tuffs Letter on position 2 (u) changed: 2 words caffs coffs Letter on position 3 (f) changed: 2 words cuifs curfs Letter on position 5 (s) changed: 1 word cuffo